nephew

A son of one’s brother or sister or of the brother or sister of one’s spouse.

A grandchild; sometimes, a more remote lineal descendant.

A cousin.

The son of one’s brother or sister. This is now the usual meaning. Sometimes, in the interpretation of wills, the word is understood as including also ‘grandnephew.’

A grandson or grandchild, or remoter lineal descendant.

A cousin.

The son of a brother or a sister, or of a brother-in-law or sister-in-law.

A son of one’s sibling, brother-in-law, or sister-in-law; either a son of one’s brother (fraternal nephew) or a son of one’s sister (sororal nephew).

a son of your brother or sister