Lyra Lina Weasley. Less commonly known as Lyra Lina Longbottom. Separated purposely from her family, after her parents were tortured into madness, Lyra lives her life with the Weasley family. The Weasley kids believe her to be Ron's twin sister. Only Mr. and Mrs. Weasley, plus Dumbledore know who she really is. Lyra is a twin, but obviously not to Ron. She is a twin to Neville Longbottom, and Neville has no idea.