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Sister-in-law: "A sister-in-law is the sister of one's spouse. The wife of one's sibling and the wife of one's spouse's sibling are also considered a sister-in-law."
As far as a student's age goes, the cutoff date for attending any given year at Hogwarts is September 1st, the start of term. Percy was born August 22, so he just barely made it in three years below Charlie instead of four. You're right though that he is closer to being four years younger than Charlie. - Nick O'Demus 00:00, 23 July 2009 (UTC)
House Points Game, 2nd term
Hello! Just to let you know, we're starting a new round of the Harry Potter Wiki House Points Game on September 15th, and we need some new members! By helping to improve the Wiki, you can earn points toward winning the House Cup. Just add your name under your favorite House on this page to join. We hope to see you soon! - Nick O'Demus 10:14, 31 August 2009 (UTC)