 On his death 29 November 1750 the barony and baronetcy became extinct.On the death of the 4th baron, the Margam estates passed to his daughter Louisa, who married George Venables-Vernon, subsequently 2nd Baron Vernon.Following her death without issue in 1786, it passed to her aunt Mary Mansell, who had married John Ivory Talbot of Lacock Abbey, Wiltshire.