I am the youngest sister, and to add to this:

I had been raised to think that anyone who didn't do things the way they were in our house was just stupid or wrong about life, and then I was forced to live with my grandparents for a while and realized that was not the case. People couldn't be horrible or stupid just because they were of a certain religion, there weren't people who were bad people just because they didn't throw away medicine bottles or because they took a shower every day. People also couldn't be horrible people just because they went to bed before midnight. Being with my grandparents, I learned that a lot of those kinds of things were actually better when done the "normal" way. Being home, I realize that I don't need permission just to eat a TV dinner, which I had been taught to do even though I actually didn't have to the whole time. Also, our parents never went to/took anyone to doctor visits or anything. All of my siblings got taken to a dentist just before their Medicaid ran out, and that was it. I've also learned to just /tell people/ things. Like, if you broke a cheap frog toy, it's ok to tells someone. You don't need to hide it under your bed.

Also, something that even our two problematic siblings get is that you can't tell someone if you feel sick or have a headache or anything because they will freak out. Like, they'll think you're asking them for a magic spell that will heal everything that is and will be wrong with you. You just wanted to mention you have a headache, because humans like telling things to other humans.

Also, don't ask if you can do a thing. Just tell someone that you're going to say, cook an egg. Don't ask if you can, they'll say no. Just tell them that you are going to or they will be mad.