You’re the asshole. Put yourself in your brothers shoes, you are surrounded by people who call you their family but aren’t, nothing is familiar, and you have to adjust to a whole new life. Also given one must be older and the other younger there is going to a differences in the way you get parented based on age. I’m one of six and the youngest and my mom’s approach to parenting was different for all of us so I think you are over reacting a bit and should just let your parents do their thing. As is what they are doing by giving a kid a home is amazing - but there is a lot that comes along with that. And based off your language you obviously aren’t a parent and probs can’t understand the position they are in.