What do you call your father's father's only son?

问题描述:

What do you call your father's father's only son?

my father was the only son

你如何称呼你祖父的唯一的儿子呢?

译:你如何称呼你父亲的父亲(即祖父)的唯一的儿子呢?
答:I call him dad/father.

father

Father