The letters reminded the widows that he, Harry Potter, was now Head of their Houses by Right of Conquest, as of two days ago. He was writing to appoint the widows to be stewards of their respective Houses, since each widow knew the workings of her House much better than Harry did. Harry then wrote, "As Head of your House, I won’t look over your shoulder and demand that you explain every purchase you make as steward, but from time to time, I’ll send goblins to audit you."