Many sources have a daughter of Stephen by the name of Alianore (which is the same as Eleanor) who m. Ralph FitzBernard. It turns out that the wife of Ralph was a granddaughter, not daughter, of Stephen & Edeline.
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He [Roger de Leyburn] married, in or before 1219, Eleanor, youngest daughter and coheir of his guardian, Stephen DE THURNHAM, by Edeline, daughter and coheir of Ranulf DE BROC (n). With her he had the manor of Great Berwick in Shropshire. She was dead by 1220. He married, 2ndly, Agnes, widow of Henry DE MINERS, of co. Hereford. He died circa 1251. [Complete Peerage VII:630, (transcribed by Dave Utzinger)]
(n) The husbands of the other 4 daughters were Thomas de Bavelingham, Adam de Bending, Ralph son of Bernard de Tong, and Ralph de Faye (she m. 2ndly Hugh de Neville, see vol X, p. 480, sub Neville). [Complete Peerage VII:630 note (n), XIV:433]