George de Cantilupe

Before 1273 the manor [of North Luffenham] had been subinfeudated to George de Cantilupe, who died in that year. Half a fee in North Luffenham was assigned in 1276 to George's sister and co-heiress Milicent, wife of Eudo la Zouche of Haringworth, formerly married to John de Montalt.

http://www.british-history.ac.uk/report.aspx?compid=66234

There are two implications here: one, that he died without heirs, and two, that there was at least one other sister to be co-heiress or to pass the heirship on to her offspring.

Aston Cantlow

Source: Sir William Dugdale. (1730). “The Antiquities of Warwickshire Illustrated: From Records, Leiger ...,” Volume 2. Page 833. < GoogleBooks >

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References