 Their son, the sixth Baronet, succeeded to the substantial Tylney estates, including Wanstead, on the death of his maternal uncle in 1784 and assumed the additional surname of Tylney.His only son, also James, the eighth Baronet, died young in 1805 and the baronetcy became extinct.Catherine Tylney-Long, daughter of the seventh Baronet and sister of the eighth and last Baronet, inherited the family estates.