They do sound a bit like they have an entitlement mentality. More so your mother. It sounds like she has been treated like a princess for too long.
If it gets down to the bottom of the barrel for them you could always send them in the direction of the local food bank or get them whatever government aid is available. It sounds harsh but I am in agreeement with you. Why should you bail out their lifestyle choices. Look after you and your own first.