third-cousin-once-removed-in-law

1- Third-cousin-once-removed's spouse.
2- Spouse's third-cousin-once-removed.

My third-cousin-once-removed-in-law is a good person.

co-second-cousin-in-law

Spouse's second-cousin's spouse.

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

co-great-great-grandaunt-in-law

Spouse's great-great-granduncle's wife.

My co-great-great-grandaunt-in-law is a good person.