You're 4th son in a large family. You realize that your oldest brother is going to get all of your father?

Question

You are the fourth son in a large family. You realize that your oldest brother is going to get all of your father's lands and possessions. There is nothing you can do about this so you decide to become a monk. What term describes this situation?

i kno itsz one of these:

fief

primogeniture

vassal

homage

Answer 1

Primogeniture, I believe.

Answer 2

It's primogeniture.  

1.  The state of being the first-born or eldest child of the same parents.

2. Law The right of the eldest child, especially the eldest son, to inherit the entire estate of one or both parents