Are their counselors who can help determine the needs my parents have?

My mother is handicapped my father is her sole caretaker. I have Lyme Disease and am not capable of taking care of anyone barely myself. We have another sister who lives out of state.
My older sister that gives my parents the help that she does, I fear she doesn't realize her doing laundry for my parents, taking them to the doctors, going there to be with my mom so my dad can leave the house once a month or longer,,,,,I am afraid my sister doesn't realize the need to have someone come in and evaluate my parents living conditions, evaluate their needs now and the future.
any attempt at speaking to my sister about the help my parents need, is met with extreme prejudice and anger…if I can't talk to my sister about what our parents need, how are we suppose to talk to our parents,, its my parents, & sister against me,,, the outsider,,, who none of them care or believe that Lyme disease prevents me from being able to live a normal life much less help them more.
My sister has I believe it gives her a sense of importance that she feels taking on more than she can handle, going to their house after working all day, doing their laundry, she says she cleans their house but its always dirty, always in disarray, My mothers has everyone falling to her beck and call. she is the one who is disabled so what ever my mom wants,,, whether it is hurting everyone else around her, she gets her way. My father is her sole care taker and my mother has no filters in her brain, or sense of appreciation for what everyone does for her. The older she gets she acts more like a victim and has a huge sense of entitlement. To keep the peace my father and everyone else in the family has to do what ever my mother wants,, its a very dysfunctional pattern that has been set in grain for many years. My older sister who works like a dog doing what she can for our parents doesn't have a sense herself of what healthy living environment is or basic food preparation sanitization…(1) EXAMPLE: : she doesn't realize throwing a dish with raw meat on it, putting it in a bucket to wash the dishes she thinks dish soap kills all the germs,, she doesn't realize Cross contamination from raw meat utensils plates sinks should be sanitized separately not throwing them in the same dish pan that she washes all the rest of the dishes !!! Their bathroom has mold growing in several areas. My mother can't reach the toilet paper, so they put the toilet paper on the sink under THE SOAP…They don't have any ramps next to the toilet for my mother to get on the toilet safely. My parents house is in shambles due to my mother ramming all the walls with her wheel chair. She uses her legs to pull herself instead of her arms like she is suppose to,, further complicating her health issues,, she has arthritis in her knees and needs a knee replacement that she refuses to get. My father and my sister has such severe care takers fatigue neither of them can see what my parents need what they are doing is not enough,, and they are not capable of giving the kind of help or guidance my parents need…..I don't even know if my parents have long term care insurance its not something I can talk to them about. If something happens to my father my mother is as helpless as a baby.