 In 1703, he married Mary Edwin, the daughter of Sir Humphrey Edwin, Mercer, alderman and Lord Mayor of London.Jones replaced his father-in-law Sir Humphrey Edwin as High Sheriff of Glamorgan for the year 1703 to 1704.When Sir Thomas Mansel vacated his parliamentary seat at Glamorganshire on being ennobled as Baron Mansel, Jones was returned at a by-election on 13 January as Member of Parliament for Glamorganshire in the Mansel interest.