The son of either your sister or your brother is your nephew. The English language does not make a distinction in that.
Your mother's brother is your uncle. Your uncle is your son's great uncle. You are the nephew of your mother's brother. Your son is his great nephew.
nephew
Nephew
Your mother's brother's son would be her nephew and your cousin.
Your father's brother's son (or daughter) is your first cousin, and is usually called by name.
No, his only son was called Hamnet. He did have a brother called Edmund.
A brother's son is referred to as a nephew.
Your brother's son-in-law could also be called your niece's husband, but he is not related to you.
Your wife's mother's brother' son is your wife's first cousin, but is not rtealted to you.
To your father 'Brother', to your father's father 'Son', to you 'Uncle'.
No, he doesn't have twin brother.
This person would generally be referred to as your cousin..