Public Isomething1 Interface
{
   string name{get;set;}
}

Public Isomething2 Interface
{
   Isomething1 aThing{get;set;}
}

Public Isomething3 Interface: Isomething1
{
   string name{get;set;}
}

Public Isomething4 Interface:Isomething2
{
   Isomething3 aThing{get;set;}
}