While the McCoy never treated him right, they never mistreated him either. So while Noah was happy to be out of their house, he didn't care much about how they lived their lives.
Well… There was one exception. At 2, Heather wasn't corrupted yet by the McCoy's mentality. In fact, before Noah altered his life, the baby girl had even shown sings of favoring him over her other siblings. Not wanting her to grow up to become like the rest of her family, he added in the Journal of Facts "While Ms. McCoy was pregnant with Heather, Mr. McCoy and her decided to give the baby up to the Williams, the family that adopted me. She is legally Heather Williams, adopted daughter of Anna & John Williams, which make her my adoptive sister. Everyone is fine with it, even her biological siblings."
Satisfied with the change, Noah verified his homework wasn't somehow unmade by Heather and him becoming the Williams' kids, so he could go play with his baby sister.