Family: Marmaduke de Thweng / Isabel de Ros (fam548041206)
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 | Marmaduke de Thweng ( -1283) |
 | Lucy de Brus (1215-1282)
|
| Cecilia Thwenge (1215- )  |
| Margery Thweng (1270- ) |
| Sir Sir William De Ros, II (1240-1310)
|
| Eustace FitzHugh (1250-1310) |
| Lucy de Ros (1270-1332) |
| Ivette de Ros (1285-1331) |
| Isabel de Ros (1274- )
|
| Lucy de Thweng, of Ingmathorpe (6770- ) |