He is your mother's first cousin and your first cousin once removed.
they are your cousin
Cousins
cousin!
aunt
That would be your Cousin.
Fathers: Mothers: Mum, ma'am, mama Fathers: Pa, Pop, Father, Papa
Mothers: Mama or Mother Fathers: Pa, Papa or Father
His relationship to you is brother-in-law.
Mom
A gatecrasher.
your mothers mother is called your grandmother. and your mothers father is called your grandfather.
In Hindi, you would call your grandfather "dada" or "dada ji."