YOU SAID:

my sister is my mother and i’m my own grandpa

INTO JAPANESE

私の妹は私の母であり、私は私の祖父です

BACK INTO ENGLISH

My sister is my mother and i am my grandfather

INTO JAPANESE

私の妹は私の母であり、私は私の祖父です

BACK INTO ENGLISH

My sister is my mother and i am my grandfather