Really you have to limit your space or should be able to limit your space that your sibblings or parents can have entering your rooms. So that they don't come close to your valuable possesion make a boreder line, not like that will hlep much if your brother has no soul. Well at my mums house my room cannot be touched but at my dads me and my brother share the same room because it's filled with junk and their no space for another room. Well he hates me touching his things and he hates me touching my things, i never touch his things...HE ALWAYS! touches mine, im like go away, get your own stuff. He always gets the comfiest bed always gets everyting he wants just so it fits him fine, it's so irraitating, so im lucky that at my mums i have my own room. Im often bugged when he reads my texts on my phone or looks through it trying to mkae me not notice, this is not over protection of my brother, this is war and noseyness...if thats a word. I enjoy his company at times but usually i lack personal space and can't wait to be back in my room alone doing things i like and not sharing with my brother.