Great-great-great-grandson's wife.
My great-great-great-granddaughter-in-law is a good person.
Spouse's great-great-great-grandfather.
My great-great-great-grandfather-in-law is a good person.
1- Fourth-cousin's spouse.
2- Spouse's fourth-cousin.
My fourth-cousin-in-law is a good person.
Spouse's great-great-grandniece's husband.
My co-great-great-grandnephew-in-law is a good person.
Spouse's great-great-great-grandmother.
My great-great-great-grandmother-in-law is a good person.
1- Great-great-grandnibling's spouse.
2- Spouse's great-great-grandnibling.
My great-great-grandnibling-in-law is a good person.
1- Parent's fourth-cousin.
2- Fourth-cousin's child.
My fourth-cousin-once-removed is a good person.