YOU SAID:
jeff went to his moms house who went to her sisters house
INTO JAPANESE
ジェフは、姉妹の家に行った母親の家に行った
BACK INTO ENGLISH
Jeff went to his sister's house. He went to his mother's house.
INTO JAPANESE
ジェフは妹の家に行った。彼は母親の家に行った。
BACK INTO ENGLISH
Jeff went to his sister's house. He went to his mother's house.
You've done this before, haven't you.