using System;

​

namespace Example

{

    public class MyType<TData,TChild>

    {

        protected readonly TChild _child;

        protected readonly TData _data;

        public MyType(TData data, TChild child)

        {

            _data = data;

            _child = child;

        }

        public TChild Child

        {

            get

            {

                return _child;

            }

        }

        public TData Data

        {

            get

            {

                return _data;

            }

        }

    }

    public class MyTypeFactory

    {

       public static MyType<TData,TChild> Create<TData,TChild>(TData data, TChild child)

       {

          return new MyType<TData,TChild>(data, child);

       }

       public static MyType<TData,object> Create<TData>(TData data)

       {

          return new MyType<TData,object>(data, null);

       }

    }

    public static class Program

    {

        static public void Main()

        {

            var grandchild  = MyTypeFactory.Create( 12 );

            var child       = MyTypeFactory.Create( 13D, grandchild );

            var parent      = MyTypeFactory.Create( 14M, child) ;

            var grandparent = MyTypeFactory.Create( 15F, parent );

            Console.WriteLine(  grandchild.GetType().FullName );

            Console.WriteLine(       child.GetType().FullName );

            Console.WriteLine(      parent.GetType().FullName );

            Console.WriteLine( grandparent.GetType().FullName );

            var grandchildValue = grandparent.Child.Child.Child.Data;

            Console.WriteLine(grandchildValue);                       //12

            Console.WriteLine(grandchildValue.GetType().FullName);    //System.Int32

        }

    }

}

​