YOU SAID:

My dad did my mom again last night with my four year old cousin

INTO JAPANESE

私の父は、私の母は私の 4 歳のいとこと再び最後の夜

BACK INTO ENGLISH

My father, my mother and my 4-year-old cousin again last night

INTO JAPANESE

私の父、私の母と私の 4 歳のいとこ再び最後の夜

BACK INTO ENGLISH

My father, my mother and my 4-year-old cousin again last night