static void Inherit()
{
//Father f1 = new Father("Khanal", "Raj");
//f1.FirstName = "";
//f1.LastName = "";
Grandfather g1 = new Grandfather("Ram", "Khanal");
Father f1 = new Father("Khanal", "Raj");
Son s1 = new Son("Rahul", "Khanal");
g1.Display();
f1.Display();
s1.Display();
}