Cousin marriage is definitely not a religious thing. Its not required of you in Islam, its just left very open and very vague. Even for people in the Pakistani culture, its very dependent on your family and how youre brought up.

Is it OK to marry your cousin in Islam?

Cousin marriage, or consanguinity (marriages among couples who are related as second cousins or closer), is allowed and often encouraged throughout the Middle East, and in other Muslim countries worldwide such as Pakistan.

Who is my mothers sister?

AUNT 1. Your mothers (or fathers) sister is your AUNT. 2. Your mothers (or fathers) brother is your UNCLE.