Uncle / Aunt (father's brother and his wife)

Literally

Paternal uncle / his wife

When to use it

Bangladeshi kinship terms are specific about which side of the family a relative is on: chacha is your father's brother (chachi his wife), distinct from the mother's side terms mama/mami. Families tell several apart by age: boro chacha (the eldest), mejo chacha (the middle one), chhoto chacha (the youngest). Some families call the father's elder brother jetha instead.

How it feels

Warm, familial; also used to politely address an older man/woman on the father's generation even if not literally related.

Formality

Familiar but respectful