How does your family deal with aging parents?

My siblings are kind of ticking me off. Dad is not in good health. Mom is a bit overwhelmed trying to deal with him. Older sister and I have been the only siblings consistently trying to help with things for years. Now younger sister, brother and sister-in-law are trying to take charge and make all decisions. My mom is not to that point yet, but they are trying to pressure her. Now brother is talking to younger sister about her becoming legal decision maker for parents.

Help! I’m trying to make sure parents get the help they need without taking away their rights to make decisions.