List myList = new List

{

new Users{ Name="Kumar", Gender="M", Age=75, Parent="All"},
new Users{ Name="Suresh",Gender="M", Age=50, Parent="Kumar"},
new Users{ Name="Bennette", Gender="F",Age=45, Parent="Kumar"},
new Users{ Name="kian", Gender="M",Age=20, Parent="Suresh"},
new Users{ Name="Nathani", Gender="M",Age=15, Parent="Suresh"},

new Users{ Name="Peter", Gender="M",Age=90, Parent="All"},
new Users{ Name="Mica", Age=56, Gender="M",Parent="Peter"},
new Users{ Name="Linderman", Gender="M",Age=51, Parent="Peter"}, new Users{ Name="john", Age=25, Gender="M",Parent="Mica"},
new Users{ Name="tom", Gender="M",Age=21, Parent="Mica"},

new Users{ Name="Ando", Age=64, Gender="M",Parent="All"},
new Users{ Name="Maya", Age=24, Gender="M",Parent="Ando"},
new Users{ Name="Niki Sanders", Gender="F",Age=2, Parent="Maya"},
new Users{ Name="Angela Patrelli", Gender="F",Age=3, Parent="Maya"},
};

now i need to format the data like

here i need to check the parent based on the parent i will be creating objects under the parent objects

now { Name="Kumar", Gender="M", Age=75, Parent="All" } this is the top level as a property Parent ="all" now under parent object kumar

here we again create a new object to store these information under object(kumar who is the parent)

new Users{ Name="Suresh",Gender="M", Age=50, Parent="Kumar"},
new Users{ Name="Bennette", Gender="F",Age=45, Parent="Kumar"},

what i need to do here is i need to check the parent based on the parent create further objects under it

ex: i need to achive like this. looking for the syntax how i can do it.

 public class SampleProjectData
        {
            public static ObservableCollection<Product> GetSampleData()
            {
                DateTime dtS = DateTime.Now;


                ObservableCollection<Product> teams = new ObservableCollection<Product>();
                teams.Add(new Product() { PDName = "Product1", OverallStartTime = dtS, OverallEndTime = dtS + TimeSpan.FromDays(3),  });


                Project emp = new Project() { PName = "Project1", OverallStartTime = dtS + TimeSpan.FromDays(1), OverallEndTime = dtS + TimeSpan.FromDays(6)  };
                emp.Tasks.Add(new Task() { StartTime = dtS, EndTime = dtS + TimeSpan.FromDays(2), TaskName = "John's Task 3" });
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(3), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "John's Task 2" });
                teams[0].Projects.Add(emp);


                emp = new Project() { PName = "Project2", OverallStartTime = dtS + TimeSpan.FromDays(1.5), OverallEndTime = dtS + TimeSpan.FromDays(5.5) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Victor's Task" });
                teams[0].Projects.Add(emp);

                emp = new Project() { PName = "Project3", OverallStartTime = dtS + TimeSpan.FromDays(2), OverallEndTime = dtS + TimeSpan.FromDays(5) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Jason's Task 1" });
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(7), EndTime = dtS + TimeSpan.FromDays(9), TaskName = "Jason's Task 2" });
                teams[0].Projects.Add(emp);

                teams.Add(new Product() { PDName = "Product2", OverallStartTime = dtS, OverallEndTime = dtS + TimeSpan.FromDays(3) });

                emp = new Project() { PName = "Project4", OverallStartTime = dtS + TimeSpan.FromDays(0.5), OverallEndTime = dtS + TimeSpan.FromDays(3.5) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1.5), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Vicky's Task" });
                teams[1].Projects.Add(emp);

                emp = new Project() { PName = "Project5", OverallStartTime = dtS + TimeSpan.FromDays(2), OverallEndTime = dtS + TimeSpan.FromDays(6) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(2.2), EndTime = dtS + TimeSpan.FromDays(3.8), TaskName = "Oleg's Task 1" });
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(5), EndTime = dtS + TimeSpan.FromDays(6), TaskName = "Oleg's Task 2" });
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(8), EndTime = dtS + TimeSpan.FromDays(9.6), TaskName = "Oleg's Task 3" });
                teams[1].Projects.Add(emp);

                emp = new Project() { PName = "Project6", OverallStartTime = dtS + TimeSpan.FromDays(2.5), OverallEndTime = dtS + TimeSpan.FromDays(4.5) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(0.8), EndTime = dtS + TimeSpan.FromDays(2), TaskName = "Kim's Task" });
                teams[1].Projects.Add(emp);


                teams.Add(new Product() { PDName = "Product3", OverallStartTime = dtS, OverallEndTime = dtS + TimeSpan.FromDays(3) });

                emp = new Project() { PName = "Project7", OverallStartTime = dtS + TimeSpan.FromDays(5), OverallEndTime = dtS + TimeSpan.FromDays(7.5) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1.5), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Balaji's Task 1" });
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(5), EndTime = dtS + TimeSpan.FromDays(8), TaskName = "Balaji's Task 2" });
                teams[2].Projects.Add(emp);

                emp = new Project() { PName = "Project8", OverallStartTime = dtS + TimeSpan.FromDays(3), OverallEndTime = dtS + TimeSpan.FromDays(6.3) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1.75), EndTime = dtS + TimeSpan.FromDays(2.25), TaskName = "Li's Task" });
                teams[2].Projects.Add(emp);

                emp = new Project() { PName = "Project9", OverallStartTime = dtS + TimeSpan.FromDays(2), OverallEndTime = dtS + TimeSpan.FromDays(6) };
                emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(2), EndTime = dtS + TimeSpan.FromDays(3), TaskName = "Stacy's Task" });
                teams[2].Projects.Add(emp);

                return teams;
            }
        }
above is an sample data where i am grouping them with static data in the same  way i need  **to  for teh data  which is cmg from DB  and i need to store them  list**

all these three data  are comig from different services. and i am storing them in a list 
 now i have  three tables  data  
Product ,
Project,
Task.  
all the data are  coming from  webservies.
 i have  created three list  where i am storing the data in  list.

List<Project>objpro= new List<Project>();
List<Product>objproduct= new List<Product>();
LIst<Task>objTask= new List<Task>(); 

 **now  what i need  to  do is  i need  to  do the mapping between these tables. 
if  you see above. i have  object of Product under Product i have  added object of  Project
 and then under project object i have  added task object.** 
 now  from the above  data which is  stored in the list i need to do the same mapping  between class.

 and  group  the data.

    public class Product : INotifyPropertyChanged
        {
            public Product()
            {
                this.Projects = new ObservableCollection<Project>();
            }
            public string PDName { get; set; }
            public ObservableCollection<Project> Projects { get; set; }
            private DateTime _st;
            public DateTime OverallStartTime
            {
                get { return _st; }
                set
                {
                    if (this._st != value)
                    {
                        TimeSpan dur = this._et - this._st;
                        this._st = value;
                        this.OnPropertyChanged("OverallStartTime");
                        this.OverallEndTime = value + dur;
                    }
                }
            }
            private DateTime _et;
            public DateTime OverallEndTime
            {
                get { return _et; }
                set
                {
                    if (this._et != value)
                    {
                        this._et = value;
                        this.OnPropertyChanged("OverallEndTime");
                    }
                }
            }

            #region INotifyPropertyChanged Members

            protected void OnPropertyChanged(string name)
            {
                if (this.PropertyChanged != null)
                    this.PropertyChanged(this, new PropertyChangedEventArgs(name));
            }
            public event PropertyChangedEventHandler PropertyChanged;

            #endregion
        }
        public class Project : INotifyPropertyChanged
        {
            public Project() { this.Tasks = new ObservableCollection<Task>(); }
            public string PName { get; set; }
            public ObservableCollection<Task> Tasks { get; set; }
            DateTime _st;
            public DateTime OverallStartTime
            {
                get { return _st; }
                set
                {
                    if (this._st != value)
                    {
                        TimeSpan dur = this._et - this._st;
                        this._st = value;
                        this.OnPropertyChanged("OverallStartTime");
                        this.OverallEndTime = value + dur;
                    }
                }
            }
            DateTime _et;
            public DateTime OverallEndTime
            {
                get { return _et; }
                set
                {
                    if (this._et != value)
                    {
                        this._et = value;
                        this.OnPropertyChanged("OverallEndTime");
                    }
                }
            }

            #region INotifyPropertyChanged Members

            protected void OnPropertyChanged(string name)
            {
                if (this.PropertyChanged != null)
                    this.PropertyChanged(this, new PropertyChangedEventArgs(name));
            }

            public event PropertyChangedEventHandler PropertyChanged;

            #endregion
        }
        public class Task : INotifyPropertyChanged
        {
            public string TaskName { get; set; }
            DateTime _st;
            public DateTime StartTime
            {
                get { return _st; }
                set
                {
                    if (this._st != value)
                    {
                        TimeSpan dur = this._et - this._st;
                        this._st = value;
                        this.OnPropertyChanged("StartTime");
                        this.EndTime = value + dur;
                    }
                }
            }
            private DateTime _et;
            public DateTime EndTime
            {
                get { return _et; }
                set
                {
                    if (this._et != value)
                    {
                        this._et = value;
                        this.OnPropertyChanged("EndTime");
                    }
                }
            }

            #region INotifyPropertyChanged Members

            protected void OnPropertyChanged(string name)
            {
                if (this.PropertyChanged != null)
                    this.PropertyChanged(this, new PropertyChangedEventArgs(name));
            }

            public event PropertyChangedEventHandler PropertyChanged;

            #endregion
        }

hope my question is clear