Married 2: Elizabeth, relict of George Hill, 6 August 1796 Buckland Filleigh DEV IGI M05005-1 lists the marriage date, the groom's name, & the bride's name
GenesReunited entries suggest this possible ancestry for Joseph:-
Thomas Risdon [~1393 -]
Geffrie Risdon [~1418 -]
Richard Risdon [1443 -] married Matilda Braye [~1443 -]
John Risdon [1468 - 1518]
Giles Risdon [1493 - 1583] married Elizabeth Bremelcombe [~1493 - 1549]
Ambrose Risdon [~1534 - 7 April 1604] married 29 May 1559 Melliore Braddon [1538 - 2 March 1619]
Pascha Risdon [1560 - 15 May 1623] married 12 February 1574 John Buttler
Philip Risdon [1562 - 23 September 1640]
Thomas Risdon [1564 - 3 August 1647] married Joanna Barnefield [~1575 -]
Thomas Risdon [~1600 -] married 29 November 1616 Petrockstow Mary Pearce
Joseph Risdon [~1625 -] married Christian Blinsham [1612 St Giles in the Wood -]
Jane Risdon [10 May 1640 -]
Mary Risdon [~1648 -]
Joseph Risdon
But I cannot find any record showing Joseph as the son of Joseph and Christian.