Are my grandparents expecting too much of me?

They adopted me as a child and they expect me to do everything for them- care, cook, clean, errands, technology, pick up their other relatives, shopping etc. I don’t have a day where I’m not doing things for them. Their children don’t do anything for them, a couple have started visiting them and helping them in the last year but before that it was all left to me and the bulk of it still is on me. The thing is, they don’t feel frustrated at their other children who don’t help or even hold it against them. Their will even significantly disadvantages me (and people gave them advice to not prioritise my wellbeing in the will) to ensure they give all the other people in their life a sum of money, and I’m just expected to smile through everything.

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They expect it
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I’m an adult, they are elderly
Are my grandparents expecting too much of me?
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