YOU SAID:

i went to a buffet for lunch today with my grandma and dad

INTO JAPANESE

私のおばあちゃんとお父さん今日のランチ ビュッフェに行きました

BACK INTO ENGLISH

My grandmother and dad went to today's lunch buffet

INTO JAPANESE

私の祖母とお父さんは今日のランチビュッフェに行きました

BACK INTO ENGLISH

My grandmother and dad went to today's lunch buffet