I'm happy that you have posted again on this fic. Please update sooner. I believe that most of the Weasley family owes Harry a life debt so using that against the Prewitts could be more entertaining. Harry is the son and godson of two marauders.
Author's response
The Weasleys have a lot of debts, and haven't been real good about paying them. As for Harry, he'll be learning about how to properly honor his heritage.