Fictional Character Appearing in the Harry Potter Book Series:

DO NOT merge with real people or into the "big tree"

"...Cedrella Weasley (née Black) (fl. 1919—1950) was a pure-blood witch, the second eldest daughter of Arcturus and Lysandra Black, and sister of Charis and Callidora. She married Septimus Weasley, who was considered a blood traitor by the Black family, and thus she was disowned and removed from the Black family tree. Cedrella and Septimus had three sons, one of whom is Arthur Weasley. Through Cedrella, the Weasley family is related not only to the Black family, but also to the Crouch and Longbottom families. Through her son, Arthur, she has seven grandchildren, five grandchildren-in-law, and twelve great-grandchildren..."

SOURCE: http://harrypotter.wikia.com/wiki/Cedrella_Black