Stiles didn't get a Hogwarts or Illvermony, he didn't get any letters when he was eleven, or even when he was twelve, because of his parents. Stiles was adopted at the age of one, and he had been in the orphanage his whole life because he was declared a squib. A squib he was not, he was simply too powerful to be measured, but nobody knew, so when Harry Potter finds out he has an older brother, what will he do when he discovered he was thought a squib by the famous Albus Dumbledore? What will Stiles do when he finally gets his Hogwarts letter at seventeen?