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.

irregular-septuple-third-cousin

Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents and thirteen great-great-grandparents in common.

Irregular-septuple-third-cousin.

third cousin-pibling

Parent's third cousin.

My third cousin-pibling is a good person.