Family: Gratney de Mar (F6779)
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 | Donald de Mar (1243-1297)
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 | Helen verch Llywelyn (1230-1296)
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| Margaret (Marjory) (Mary) de Mar (1270-1326)  |
| Isabel de Mar (1278-1297) |
| Margaret de Mar (1274- ) |
| Gratney de Mar (1272-1305)
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