Margaret is the daughter of Marmaduke de Thweng and Isabel de Ros. She married Robert Hilton of Swine, Yorkshire,[1] as his second wife. They are the parents of:
Isabel
m. Walter Pedwardine.
Maud
m. John de Hotham.
Sources
Banks, T. Baronia Anglica Concentrata, 1, pp. 252. London: Simpkin, Marshall, and Co. Archive.org.[1]
Burke, B, (1866). "Thweng: Barons Thweng," in A Genealogical History of the Dormant, Abeyant, Forfeited and Extinct, Peerages of the British Empire, pp. 5325. London: Harrison. Google Books.
Richardson, D. "Hotham," in Royal Ancestry, III, p.322.
Margaret-282 and Thweng-21 appear to represent the same person because: There are problems with dates, but I think there is an entire line of profiles that need to be merged.