YOU SAID:

My mother's mother's mother's stepdad knew a kid who had a kid who had a kid who's best friend has been to korea

INTO JAPANESE

私の母の母の母の継父は、親友の子供がいる子供がいる子供を知っていました。

BACK INTO ENGLISH

My mother's mother's mother's stepfather knew a child who had a child with a best friend's child.

INTO JAPANESE

私の母の母の母の継父は、親友の子供と子供がいる子供を知っていました。

BACK INTO ENGLISH

My mother's mother's stepfather knew her best friend's child and the child with the child.

INTO JAPANESE

私の母の母の継父は、彼女の親友の子供と子供と一緒の子供を知っていました。

BACK INTO ENGLISH

My mother's mother's stepfather knew her best friend's child and the child with the child.