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Watson, in his "History of the House of Warren", corroborated by Camden and Ormerod, makes this Reginald to have married Aldelia de Mowbray, and to have had a son, William, from whom he deduced the family of Warren, of Poynton, co. Chester.
That line is given here:
(XIII) Reganal de Warrenne, married Adela, daughter of Roger de Mowbray.
From Genealogical and Personal Memoirs Relating to the Families of the State of Massachusetts, Volume 4 (Google eBook) William Richard Cutter, William Frederick Adams. Page 2165