Family: Marmaduke de THWENGE, 1st Baron of Twenge / Isabel de ROSS (F9901)
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 | Marmaduke de THWENGE, Lord Kelton (1234-1294) |
 | Lucy de BRUS (1223- )
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| Robert de THWENGE (1255-1284) |
| John de THWENGE (1261-1330) |
| Margery de THWENGE, Baroness Neville (1264- ) |
| Alice de THWENGE (1265- ) |
| William de ROSS (1244-1310)
|
| Eustace FITZHUGH OR FITZRALPH (1268- ) |
| Lucy de ROSS (1270-1333)  |
| Alice de ROSS (1284- ) |
| Ivetta de ROSS (1290-1331) |
| Marmaduke de THWENGE, 1st Baron of Twenge (1256-1323)
|
| Isabel de ROSS (1280- )
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| Lucia de THWENGE (1278- ) |
| Marmaduke de THWENGE, Master of Kilton (1280-1297) |
| William de THWENGE, 2nd Baron of Thwenge (1285-1340) |
| Robert de THWENGE, 3rd Baron of Thwenge (1293-1344) |
| Margaret de THWENGE (1295- ) |
| Katherine de THWENGE (1297-1374) |
| Thomas de THWENGE, 4th Baron of Thwenge (1299-1374) |