Grandfather
Grandpa
noun, の adjective
そふ
継父 (けいふ、ままちち) Stepfather
祖父 (そふ) Grandfather, Grandpa
祖母 (そぼ) Grandmother, Grandma
祖父母 (そふぼ) Grandparents
お祖父さん (おじいさん、not on WK) Grandfather, Old Man
お婆さん (おばあさん) Grandmother, Old Woman, Old Lady
お婆ちゃん (おばあちゃん) Granny, Grandma, Old Lady, Old Woman
伯父 (おじ、さん) Uncle
叔父 (おじ、さん) Uncle
伯母 (おば、さん) Aunt
叔母 (おば、さん) Aunt
He has a soft そふ(と) spot for his Grandfather.
His Grandfather is so そ foolish ふ