Sometimes family members who seem to be doing fine really are not. Make caring for your parent a responsibility for the whole family. It is not just the adult daughter's job. Other siblings as well as children are close to their grandparents and are willing to help. Make everyone in the family aware of any problems.
Full explanations are important.
If an adult has Alzheimer's, for instance, it can be very frightening and very challenging. Acceptance and responsibility often come with proximity. But others must be expected to share the burden. If a parent moves into your home, that person should have their own room and phone. Always discuss expectations in advance.