Your family situation sounds rather confusing and whatever has lead to this has probably caused a lot of stress resulting in effecting peoples tempers. Can you talk to your mum about how they're treating you and maybe ask her to have a quite word.
Or you could talk to them individually and ask why they feel the way they do (why they think you're ungrateful & spoiled) and see if you can do anything to change their opinions of you?
xxx
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