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Son of Guillaume de la Ferté-Macé and Muriel de Conteville Brother of Margaret de Massey; Hamon de Mascy, 1st Baron of Dunham Massey; Mathieu de la Ferté-Macé; William de la Ferté-Macé, Baron of la Ferte-Mace; Hugue de Macey and 1 other; and Marie de Massey « less Half brother of Pierre de Valoignes, (I), seigneur de Valognes and Muriel de Capello
Some sources list Robert as a son of William de la Ferte-Mascy. https://www.facebook.com/friends.baguley.hall?ref=stream