If you parent(s) are struggling and you have a job yourself, it's only right that you contribute something to the household, whether that's paying for some of the bills or the food or whatever. However your parent(s) need to be reasonable - asking for over half of someone's wages is unfair but asking for a smaller portion is okay. If you want to save up for a car etc that's fine, it just depends on how you're using the money left over form your wages after you've given your mum what she needs. If you're sensible and save most of what you earn (obviously there are things you'll always have to pay for, toiletries, public transport, whatever) then you'll soon be on the right track.