5X-grandfather

Great-great-great-great-grandfather.

My 5X-grandfather is a good person.

step-great-grandfather-in-law

Spouse's step-great-grandfather.

step-great-grandfather-in-law.

great-grandfather-in-law

The great-grandfather of one's spouse.

My great-grandfather-in-law is a good person.

great-grandfather-in-law

Spouse's great-grandfather.

great-grandfather-in-law.

3X-grandfather

Great-great-grandfather.

My 3X-grandfather is a good person.

grandfather-in-law

A grandfather of one's spouse.

My grandfather-in-law is a good person.

grandfather-in-law

Spouse's grandfather.

grandfather-in-law.