Spouse's third-cousin-once-removed's spouse.
My co-third-cousin-once-removed-in-law is a good person.
1- Parent's third-cousin.
2- Third-cousin's child.
My third-cousin-once-removed is a good person.
1- Great-great-grandparent's sibling's great-grandchild / Parent's third-cousin.
2- Great-grandparent's sibling's great-great-grandchild / Third-cousin's child.
My third-cousin-once-removed is a good person.
1- Parent's third-cousin.
2- Third-cousin's child.
third-cousin-once-removed.
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.