I noticed something while watching Sherlock(BBC) today. What if Moriarty was the middle child of the Holmes Family? I say that because if someone looked at my siblings and I, you wouldn't know immediatly that my older brother was related to me. He's got dark brown, almost black, hair and eyes while my sister and I have lighter blue eyes and light brown hair. Though her hair is right between brown and blonde while mine is just brown. You can see the resemblence between my sister and I but you wouldn't know unless we told you that he's my brother. It's basically the same thing with Mycroft, Sherlock, and Moriarty. Mycroft has lighter hair than Sherlock but they kind of have the same eyes while Moriarty and Sherlock have almost the same color hair but completely different eyes. Moriarty has brown, almost black, eyes and dark hair. Sherlock has light blue, maybe green or grey, eyes and dark hair. The three men could be brothers and we would never know because all we know, that's a fact, is that Mycroft and Sherlock are brothers. Mycroft is most likely the older brother while Sherlock is obviously the youngest brother of the whole family. Maybe Moriarty was too much trouble for them? Gave him away because he was obsessed with killing? Unique names is somewhat a tradition, I think, so maybe his first name was James but his middle name was something interesting and his adopted parents' last name was Moriarty and they changed it. Who knows?