Your mother's father's uncle is your mother's great uncle and your great great uncle.
Your mother's mother is your grandmother.
I would call him by his name. You do not share a common ancestor, so are not related.
He is your uncle, in most families he would be Uncle (Jack, Fred or what ever his first name is).
uncle
uncle
Your Uncle.
Your father's brother is your uncle.
Aunty and Uncle.
I call my mother mom
philapple Uncle
its dadaji or nanaji for fathers dad nd for mothers dad respetivly
Fathers: Mothers: Mum, ma'am, mama Fathers: Pa, Pop, Father, Papa