YOU SAID:

I had an affair with my mom

INTO JAPANESE

私のママと浮気をしていた

BACK INTO ENGLISH

My mom had affair

INTO JAPANESE

私の母は、事件をいた

BACK INTO ENGLISH

My mother was the case

INTO JAPANESE

私の母親は事件だった

BACK INTO ENGLISH

My mother was an incident

INTO JAPANESE

私の母は事件だった

BACK INTO ENGLISH

My mother was an incident