YOU SAID:
what the flip are you doing, to grandpa
INTO JAPANESE
フリップがおじいちゃんにしています。
BACK INTO ENGLISH
Flip is making him a grandpa.
INTO JAPANESE
フリップは彼をおじいちゃんにしている。
BACK INTO ENGLISH
Flip makes him a grandpa.
INTO JAPANESE
フリップは彼をおじいちゃんにする。
BACK INTO ENGLISH
Flip makes him a grandpa.
That didn't even make that much sense in English.