And don’t forget the kink that, in Breaking Bad, Walt uses the term to refer to his spouse’s sibling’s husband.
It really depends how tight knit families are and how families are spread accross the world. I have to take a plane and cross some borders in order to visit my parents or my sibling's and same applies to my partner so there is that.
Which also makes sense - siblings who have good relationships meet up often and once having partners, those partners meet up too.
1. (father’s older brother) 伯父 [bófù] (位, wèi)
2. (father’s younger brother) 叔父 [shūfù] (位, wèi)
3. (father’s sister’s husband) 姑父 [gūfu] (位, wèi)
4. (mother’s brother) 舅父 [jiùfù] (位, wèi)
5. (mother’s sister’s husband) 姨父 [yífu] (位, wèi)