"Harry, my boy," Dumbledore said, "I may have found a solution to the problem the death of your aunt and her family has left us with. I will grant the relationship is several generations removed, but my extensive research into your mother's background has revealed that I am, somewhat to my own surprise, your great-great-great-great-great-grand-uncle." The headmaster beamed genially at the teen.
Harry looked stunned. "You mean I'd live with you?" he said after a moment. "In your house? And we could continue the blood wards that way?"
"I believe the wards can be extended to protect you here. As headmaster, I reside at Hogwarts, and I know you are already close to thinking of the school as home. It would not be a workable long-term solution - the relationship is very distant - but since you will be graduating in under two years, I do think it will work long enough."
"That's - that's wonderful! Id' be able to stay here, then, over the summer?" Harry frowned suddenly. "But sir, if I'm related to you, why didn't you know this before?"
"Ah, well, I'm afraid that your four-times-great-grandmother was what we at the time called a 'love child' - a product of my brother Aberforth's indiscretions, rather than a result of a lawful marriage." Dumbledore peered at Harry over his spectacles, looking concerned. "He was rather precocious, I'm afraid. She was taken to be raised elsewhere. In all honesty, I doubt I've given her more than a moment or two of thought in the last century, although of course it was a tremendous scandal at the time."
"But you're sure we're related? That I'm the descendant of your brother and the girl he was, um, involved with?"
"Oh, quite certain, I assure you, although I'm afraid the affair wasn't simply the result of an indiscreet dalliance with a local lass." The headmaster herded Harry our of his office and down the stairs. "No, I'm rather afraid he had an affair with his nanny."