YOU SAID:

my mom drank all my milk and then I had a kid with my great great granmother and killed her while doing it.

INTO JAPANESE

母は私の牛乳を全部飲み干し、それから私はひいひいおばあさんとの間に子供をもうけ、その間に彼女を殺してしまいました。

BACK INTO ENGLISH

My mother drank all my milk, then I had a child with my great-great-grandmother, and killed her in the meantime.

INTO JAPANESE

母は私の牛乳を全部飲み干し、それから私は高祖母との間に子供をもうけ、その間に彼女を殺しました。

BACK INTO ENGLISH

My mother drank all my milk, then I had a child with my great-great-grandmother, and killed her in the meantime.