Planning for the future

I’m 24 years old and I have to kids, I still live at home with my parents but I’m in the process of moving. I have a little brother with autism and my parents want to plan for the future since they are getting up there in age. They said that when they pass they want me to take care of him, I don’t mind doing that but I have my own kids to raise. When I was growing up, I felt like I was the parent. I never had a child hood I always had to stay in the house and babysit him from the age of 11 till 19. I could never go out with friends no parties nothing. I couldn’t even go outside, every summer,winter,fall and spring in the house baby sitting. I had my first child at 19 even then they expected me to still help with him. I’m not bashing him but he is stuck in baby mode my parents always took up for him because he was younger I hated/ still hate being a big sister. I feel like when my parents first saw that he had an issue they should have gotten him help, he is now 17 basically a grown man. He doesn’t now how to cook, clean or do basic hygiene some has to help him clean his self. Once my my kids are 18, I’m living my life I’m going on trips vacations everything I always wanted to do. And my brother does not fit in that picture. Even now to this they are still not getting him help. He also can curse very well and also has a smart mouth. I feel like if you can back talk and refuse to do things around the house then your well enough to take care of your basic needs and you can also get a job and provide for yourself. Then also keep in mind I’m not going to live forever as well, if I pass right after my parents then what? I tell them this and they say my kids will take care of him, I’m like wtf get him help because I plan on buying a house that’s big enough for me, my kids and husband. I have my own life to live.