Your mother's brother is your uncle.
papu
That would be an uncle.
if its fathers brother then he is called Chacha in hindi. If its mothers brother then he is called Mama. What about mothers sisters husband?
brother
Mothers brother ( uncle ) = amoo
Your Uncle.
uncle
Your mother's son is your brother or your half brother.
A cousin brother means , the son of the father or mothers , brother or sister.
mamo
your uncle
His relationship to you is brother-in-law.