Cousin brother
Your nephew's son is your great nephew.
A nephew is a cousin to his aunt's son.
Your nephew's daughter's son is your great-great nephew. Your nephew's daughter is your great niece.
Your nephew.
Your brother's son is your nephew. Therefore, your brother's son’s son would be your great-nephew. In summary, your brother's son son is your great-nephew.
Your husband's sister's son is your nephew, just as your sister's son is your nephew.
Your son and your nephew are First Cousins. The children of your nephew and the children of your son are Second Cousins to each other.
cousins.
great nephew
The child of your nephew is your great nephew (if a son) or your great niece (if a daughter).
Your sister-in-law's son is your nephew.
Your brother-in-law's son is your nephew