How to call my father's elder and younger brother?

Your father's brother is your uncle.
Your mother's brother is your uncle.
Your fathers sister is your aunt.
Your mother's sister is your aunt.

English does not have specific names for older or younger uncles and aunts, nor for the father's side / mother's side.
So if Bob is the name of my father's older brother, and John is my father's younger brother, I call them Uncl

There are specific names for father's and mother's sides. If your uncle or aunt is from your father's side, you can say 'paternal uncle' or 'paternal aunt' respectively and if in mother's side, 'maternal uncle' and 'maternal aunt' respectively.

AnonymousThere are specific names for father's and mother's sides. If your uncle or aunt is from your father's side, you can say 'paternal uncle' or 'paternal aunt' respectively and if in mother's side, 'maternal uncle' and 'maternal aunt' respectively.

Most of us don't. If, for some reason, we need to be more specific, then we say "my father's brother' rather

English doesn't have importance of relationships in life, it shows how much you care of loved ones.

AnonymousEnglish doesn't have importance of relationships in life, it shows how much you care of loved ones.

That's a sweeping over-generalisation.

Paternal Uncle

NithilaHow to call

What to call

Anonymous What to call

The question is 'What should/do/can we call? ...'

'What to call ...' is appropriate as the title of an article.

So if i have introduce my father's elder brother i'm gonna say he is my "paternal elder uncle" or if I introduce his wife than she is my "paternal elder aunty" right. Correct if im wrong

Just say:

This is Mr. Singh. He is my father's elder brother.
This is Mrs. Singh. She is my aunt, the wife of my father's elder brother.