Honestly, I hate to say it, but I do base this on facts, the double standard in my case was my brother was my mother's natural child whereas I was adopted (grudgingly) by her. She made no secret of the fact she felt forced into taking me. She didn't want me and even though in many ways she did her best, her resentment and mental illness never let her really get over being saddled with a kid that wasn't her's and that was, well, not bad, but certianly difficult. Damn there's a new story....
Plot twist, when I became a lawyer and strated paying her bills, I became the golden child and be all and end all...hmmmmmm....