first co-cousin-in-law 

The child-in-law of one's parent-in-law's sibling.

My first co-cousin-in-law is a good person.

first co-cousin-in-law by Elivaldeq November 24, 2019

brother-in-law

1. The husband of one's sister.
2. The brother of one's spouse.

My brother-in-law is a good person.

brother-in-law by Elivaldeq November 24, 2019

sibling-in-law

1. The spouse of one's sibling.
2. The sibling of one's spouse.

My sibling-in-law is a good person.

sibling-in-law by Elivaldeq November 24, 2019

co-sibling-in-law 

The spouse of one's spouse's sibling.

My co-sibling-in-law is a good person.

co-sibling-in-law by Elivaldeq November 24, 2019

co-sister-in-law 

The wife of one's spouse's brother.

My co-sister-in-law is a good person.

co-sister-in-law by Elivaldeq November 24, 2019

co-brother-in-law 

The husband of one's spouse's sister.

My co-brother-in-law is a good person.

co-brother-in-law by Elivaldeq November 24, 2019

grandaunt-in-law 

1. The wife of one's grandparent's brother.
2. The sister of one's grandparent-in-law.

My grandaunt-in-law is a good person.

grandaunt-in-law by Elivaldeq November 24, 2019