Great great great great grandpa

A: mommy, who is our great great great great grand pa?
M: I don't know, you’ll have to ask your grandpa.
A: I don't think he'd know.
M: Then why do you think I would know?
O: I know, grandpa is our great great....... grandpa.
M: Grandpa being a great person doesn't make him your great great....... grandpa.
A: If he is, he would be a caveman, Olivia.
O: Then what does that make grandma?
A: She'll be a cave woman.
O: What about 姑婆?
A: Cave aunt
O: How about “yee-sum” (二嬸)?
A: Cave sum
O: “Yee suk” (二叔)?
A: Cave suk suk.
O: Daddy?
A: Cave dad.
O: Mommy?
A: Cave mom.