Before editing, be sure to read the wiki's policies. Please sign your name on Talk and vote pages using four tildes (~~~~) to automatically produce your name and the current date. Be sure to verify your e-mail address in your preferences. Before attempting any major article rewrites please read the layout guide. If you have any questions, check out the policy and help pages (see here for editing help), add a question to the Community portal, view the forum or ask me on my talk page. Again, welcome!
To answer your question, everything in this wiki is based on canonical information, that is, what we learn from the books, movies, or from the mouth of JKR herself. Edits such as adding non-existent children and marriages to the children of Harry Potter and his friends is considered Fanon. THere is a separate Harry Potter Fanon wiki. Thank you, --JKoch(Owl Me!) 19:07, June 23, 2010 (UTC)