I can't wait to read more on Harry's life with his new mother and his new home, please update chapter 5 soon.
I need more!! What happens next?! Does Charlie get to see the inner workings of the dragon society?? Does he get all his questions answered?? Does he become a love interest for Harry?? What happens with Harry's changes?? Do the tamers use Barry's inside knowledge to help them with the dragons?? Does he become a translator for the humans and dragons? How does Harry get along with his new siblings? What does his mother feed him? Does he choose to live out his life there? Does he make up with his friends and the rest of Hogworts??
It's interesting story yo read, but maybe you should remove Complete tag, as clearly you are writing more pages.