My plans to move were temporarily interrupted by my mother moving in with me. Should I make her move too?

My father has recently passed away and since I'm the only unmarried child and live just around the corner, I have decided to move back into their home to take care of her. My mother is making future plans with me as if I were my father. She wants to travel nationally and internationally and to visit my siblings who, for the most part, live in other states.

I, myself, have had plans to move abroad by next summer, which I had never informed my parents. This would be a permanent move. I would still like to keep this dream.

My mother doesn't want to leave her two favorite grandchildren who live about 5 minutes away and has told me that she doesn't want to live with my sister (the mother of these grandchildren) because she doesn't want to be mistreated. My other siblings live on the east and west coasts.

What should I do?