Is it realistic for family from out of town to expect me to cook for them?

If you didn't invite them for Easter dinner, they shouldn't have expected it. In fact, if they had any awareness, they should have invited you both out to a restaurant for dinner or had a meal brought in if your mother is housebound. They should be coming into town to give you a break from caregiving duties, not add more work and stress to your life. Apparently, they're completely clueless. Sheesh!!!

I guess different folks have different expectations. I would have expected them to treat you and mom to dinner out. I guess it's best to discuss plans before the event next time. If you invited them for a holiday visit, they may well have expected that food would be served.

Different families have different expectations, as do different ethnic groups and cultures. As families become more mobile, both geographically and economically, expectations that are unspoken lead to hurt feelings. To someone living on a very low income, someone living in their own home appears wealthy, when in fact they are struggling to pay the mortgage. Try to let go of hurt and make sure that the expectations are out in the open next time.