What do you call your grandfather's brother?
Category:
hobbies and interests
genealogy and ancestry
There is no inconsistency. Grand is always used for "parent of a parent". Beyond that, great- and grand- mean the same thing. Your grandfather's brother is your great-uncle, grand-uncle, or granduncle.
Also question is, what do you call your grandmother's brother?
granduncle
Keeping this in consideration, what do you call your grandfather's grandfather?
For geneaology your great great grandfather (maternal/paternal) In family Grandfather (name) With your grandfather (Your grandfather) In many cultures everyone older in the famil gets to be called Grandpa or Grandmother as a sign or respect. Even if they are technically aunts, uncles or grandmother-in-law.
Your common ancestors are your grandmother's parents (assuming your grandmother and her brother were full-blooded), which are two generations above her. Two-generation relations are first cousins; you are once removed from that relation, so you are first cousins once removed.