1. The father of one's stepgrandparent.
2. The stepfather of one's grandparent.
My step-great-grandfather is a good person.
The great-great-grandfather of one's spouse.
My great-great-grandfather-in-law is a good person.
1- Step-great-grandparent's father.
2- Great-grandparent's stepfather.
My step-great-great-grandfather is a good person.
Great-great-grandparent's father.
My great-great-great-grandfather is a good person.
Spouse's great-great-great-grandfather.
My great-great-great-grandfather-in-law is a good person.
Great-great-great-grandparent's father.
My great-great-great-great-grandfather is a good person.