first cousin-uncle-in-law

1. The husband of one's grandparent's sibling's daughter.
2. The son of one's grandparent-in-law's sibling.

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

first co-cousin-uncle-in-law

The son-in-law of one's grandparent-in-law's sibling.

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