I think that might be quite common. In Swedish we have morbror/farbror (literally mother-brother/father-brother) and moster/faster (mother's sister/father's sister). It's similar for grandparents.
But interestingly no distinct words for grandfathers, both grandfathers are called "dede" (so no "babababa" or "annebaba")
- Father's side:
Uncle:
Older than father (age_position_prefix + Jethu):
1. Eldest: Boro Jethu
2. After him: Mejo Jethu
3. After him: Sejo Jethu
4. After him: Chhoto Jethu
Younger than father (age_position_prefix + Kaaku):
5. Eldest: Boro Kaaku
6. After him: Mejo Kaaku
7. After him: Sejo Kaaku
8. After him: Chhoto Kaaku
Aunt:
Same age_position_prefix as above but common suffix: Pishi
- Mother's side:
Uncle:
Same age_position_prefix as that on the father's side but common suffix: Maama
Aunt:
Same age_position_prefix as that on the father's side but common suffix: Maashi
Boro means eldest
Mejo means middle
Sejo means younger than the middle
Chhoto means youngest
So men on the father's side have more dedicated words than others.