4.5-tuple-third-cousin

4.5-tuple-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and nine great-great-grandparents in common.

My 4.5-tuple-third-cousin is a good person.

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.