The plural of nephew is nephews, and the plural of niece is nieces.The rarely-used slang term that includes both male and female is nibling, plural niblings.
Niece is to nephew as sister is to brother.
Niece would be an opposite as a niece is female and a nephew is male.
Your nephew's sister is your niece.
Your brother's or sister's son is your nephew. Your nephew's or niece's child is your grand-nephew or grand-niece.
The male counterpart of a niece is a nephew.
If you have a niece or nephew, it is their daughter.
The son or daughter of one of your siblings children is your great niece or great nephew. In other words, the grandson or granddaughter of your brother or sister is your great niece or great nephew.
They are first cousins once removed.
sisterNo it would be Niece is to Nephew as Sister is to Brother. Niece and sister are both female, nephew and brother are both male.
you would be the child's great aunty or uncle Therefore, they would be your great niece or nephew.
Your daughter-in-law's niece and nephew would be considered your grandchildren's cousins. So, you would be their grandparent-in-law.