YOU SAID:

if I like 10 and my sister likes 10 then who gets 10?

INTO JAPANESE

私は10が好きで、私の妹が10が好きなら、誰が10を得るのですか?

BACK INTO ENGLISH

If I like 10 and my sister likes 10, who will get 10?

INTO JAPANESE

私が10が好きで、妹が10が好きなら、誰が10を得るのだろうか?

BACK INTO ENGLISH

If I like 10 and my sister likes 10, who will get 10?