Lord Grey married his first cousin Lady Katherine Charteris Wemyss, daughter of Francis Douglas, 8th Earl of Wemyss, in 1824. He died in October 1835, aged 33, predeceasing his father. As he died before his father he is held to have become the 8th Baron Grey. His son George succeeded in the earldom in 1845. Lady Grey died in January 1844, aged 42.[1]