Sibling's great-great-great-grandson.
My great-great-great-grandnephew is a good person.
Half-sibling's great-great-great-grandson.
My half-great-great-great-grandnephew 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-grandnibling's husband.
My co-great-great-grandnephew-in-law is a good person.
1- Great-great-grandniece's husband.
2- Spouse's great-great-grandnephew.
My great-great-grandnephew-in-law is a good person.