I Need Advice Please!

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My mother has been very ill for quite some time. Up until the end of August of last year I had been her primary caretaker. I moved away, my brother was living with her so it was alright. I moved back, and it seems like since I've been back she's become more dependent on me again. Here's the problem: My brother is leaving in a week for Europe, where he'll be for three months. I'm leaving for summer work a few weeks later. I'm worried because my mom is so dependent on us for a lot of things. I asked her what she's going to do once we're gone, and she said she'd hire someone. She's said she do that before, but then she stayed dependent on my brother and I anyway. My question is, in order to make her less dependent, should I stop helping her out as much so she'll actually be forced to hire someone? I'm worried that we'll both be gone and she'll have no one to help her out. Is this selfish of me to want to go and live my life?