first cousin-pibling-in-law

1. The spouse of one's grandparent's sibling's child.
2. The child of one's grandparent-in-law's sibling.

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

first co-cousin-pibling-in-law

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

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