first-cousin-thrice-removed-in-law

1- First-cousin-thrice-removed's spouse.
2- Spouse's first-cousin-thrice-removed.

My first-cousin-thrice-removed-in-law is a good person.

co-first-cousin-thrice-removed-in-law

Spouse's first-cousin-thrice-removed's spouse.

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