YOU SAID:

I did your biological mother

INTO JAPANESE

私はあなたの実の母親をしました

BACK INTO ENGLISH

I was your biological mother

INTO JAPANESE

私はあなたの実の母親でした

BACK INTO ENGLISH

i was your biological mother

INTO JAPANESE

私はあなたの生物学上の母親でした

BACK INTO ENGLISH

i was your biological mother