“Since when is the wife or her parents responsible to support HIM?”
They aren’t. Every Askenazic Ketubah for the past millenium has stated otherwise.
And since we are quoting Rambam it should be noted what else Rambam wrote, about being supported in learning by the community:
?? ????? ?? ??? ?????? ????? ??? ???? ????? ??????? ?? ????? ??? ?? ??? ?? ??? ???? ?? ????? ???? ???? ??? ???? ??? ????? ???? ???? ?? ????? ??? ??? ????? ?????? ????? ???? ????? ??? ???? ????? ?? ????? ????? ???? ??? ???? ?? ????? ???? ??? ????? ?? ???? ???? ?????? ??? ??? ????? ????? ??? ???? ??? ????? ???? ?? ?????? ???? ?? ?????? ??? ???? ???? ??? ????? ???? ????? ?????? ??? ???? ??? ?? ???? ????? ?? ??????: