niece-in-law

1- Nephew's wife.
2- Spouse's niece.

My niece-in-law is a good person.

nephew-in-law

1- Niece's husband.
2- Spouse's nephew.

My nephew-in-law is a good person.

uncle-in-law

1- Aunt's husband.
2- Spouse's uncle.

My uncle-in-law is a good person.