Ancestor is defined recursively as your:
1, Parents, AND
2, Your parent's ancestors.
One of my ancestors fought in World War 2!
A word for "friend" to be used informally and colloquially, in the same way that 'mate' or 'dude' are.
Also the plural can be used to address a larger group of friends, in the same way as 'guys' can.
So ancestors, what are we doing tonight?