Yeah, they want to do less work (no work, ideally), but when you take on her house work she realizes on an instinctual level what a pussy you are. Instant sexual turn-off. Possibly permanently. You've moved yourself down below her level and she will only fuck you now on a transactional level.

You either lead the family or you are relegated to a beta-bitch who will be treated about as good as a misbehaving roommate.