While it sucks for the brother and I wish she wouldn't treat him so; I do understand how she could end up like this. She's had to do many things to reach the position she's in now, and she seemed to have been stolen away too I guess
@Deakmaniac She may have been "stolen" but I don't recall author mentioning. It appears she "decided" this path after being abandoned. She never bother to ask why did her brother, while being so young, left.