My sister's husband can be called brother-in-law, brother-in-law, or uncle.
Her sister's husband could be called her brother-in-law or her brother-in-law's name.
Your daughter can call your sister's husband "uncle." This was because her sister's husband was called uncle in the family.
The child calls my sister's husband uncle.
Your wife's sister's husband should be called brother-in-law.
Calling her sister was an intimate and friendly form of address for boys, similar to how siblings addressed each other. This form of address expressed the friendliness and closeness of boys to girls. In some local dialect and context, this form of address was very common, reflecting the way of communication and friendship in a particular social circle.
There were many different ways of addressing uncle. In some places, the male's father was called granduncle, and the uncle's mother was called grandaunt. In some places, they were addressed according to traditional kinship. The father and mother of the uncle could directly address him as his biological grandfather and grandmother, or they could also address him as grandfather and grandmother, but this kind of address might be a little far-fetched. In addition, there were some other ways of addressing people, such as calling an uncle's niece a niece, calling an aunt's niece an aunt, and so on. According to the information provided, there was no clear answer as to how you should address your uncle.
Your uncle-in-law can be called "uncle" or "uncle".
There were many different ways of addressing uncle. In some places, the male's father was called granduncle, and the uncle's mother was called grandaunt. In some places, they were addressed according to traditional kinship. Uncle's father and mother could be directly addressed as biological grandfather and grandmother. In addition, the way of addressing could also be decided according to personal habits and regional customs. Since the information provided did not provide a clear answer, I was unable to determine the specific form of address.
Brother-in-law and sister's child call me nephew.