His father had been summoned to Parliament in 1375 as Robert Ferrers of Wem. Under modern peerage doctrine the manner in which he was named in this summons would be viewed as creating a novel peerage, the Barons Ferrers of Wem, to which his son Robert, who was never himself summoned, would be viewed to have succeeded as 2nd Baron on his father's death in 1380.
However, in Complete Peerage, Vicary Gibbs argues that contemporary practice was not so regimented as it would become, and that the elder Robert had clearly been summoned simply as possessor, jure uxoris, of the same barony previously held by his father-in-law William, Baron Boteler of Wem. His mother's 3rd husband, Sir Thomas Molinton, would in turn in his will style himself 'Lord of Wemme', jure uxoris, though he was never summoned. Were it the case that his father was summoned only jure uxoris, then Elizabeth's son Robert Ferrers, who was never himself summoned, would not have been a peer as he predeceased his mother.
Following this Robert's death in 1396 and of his mother in 1411, the Barony Boteler of Wem and any Barony Ferrers that might be held to have been created by the 1375 summons would have gone into abeyance between his two daughters.[1]
