Yeah they do .

Yes we do, we always marry each other.

yah, Nigerians are fond of inter-tribal marriage. Unless those who travel abroad who felt they should marry elsewhere due to certain reasons.

Nayah:

No henry he's the only son and the last one,

As the only son, I think sometimes it's difficult to marry outside his tribe.
Except He was raised outside the country or his parents are very liberal.
He might be real and sure wants to settle down with u but pressure back home might be the "decider".
Sit him down and discuss your fears with him.
Also try to get closer to his family or atleast take trips to Nigeria with him to know his people.
Wish u the best.