Your brother has a sister on his moms side you are your brothers sister on your father side is your brothers sister your sister?

Answer She would be your step-sister

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Which pair of sibling relation is most complicated - 2 brothers or 2 sisters or older brother - little sister or little brother - older sister?

I come from a family of 13..... 7 girls 6 boys same two parents....... I sit at number ten grew up with my two sisters above me 9 and 8 and a set off twin boys 11 and 12 and the youngest lucky numb... Read More »

What do you call the lady that is your mother's only sister's husband's sister in law He has no brothers?

Your mother's sister is your aunt and her husband is your uncle. If he has no brothers, his sister-in-law must be either your mother or another one of your mother's sisters (your aunt)

In general why most brothers' wives are more beautiful than husbands' sister- this is not my situation but I have noticed this many times with many people and most of the sister-in-laws?

Since most husband's sisters will eventually become some brother's wife, this "observation" is clearly nonsense.

If my mum is my friend's aunt's sister in law's sister brother's wife's sister how is she related to me?

That all sounds slightly incestuous, but she is your mum obviously, 'cause you told us at the start!!