Daughter of their great-grandparent’s half-sibling with the other great-grandparent’s full sibling.
My sesqui-first great-cousin-aunt is a good person.
Spouse's step-great-grandparent.
step-great-grandparent-in-law.
Your sibling’s granddaughter.
My mother is not a grandma, but her sister and brother are which means she has a few great-nieces.
My non-biological paternal grandfather has a super beautiful great-niece who is the granddaughter of his youngest brother.
1- Great-great-granduncle's wife.
2- Spouse's great-great-grandaunt.
My great-great-grandaunt-in-law is a good person.
1- Great-great-grandpibling's wife.
2- Spouse's great-great-grandaunt.
My great-great-grandaunt-in-law is a good person.