« Reply #16 on: Sunday 18 August 13 10:20 BST (UK) »
there's a marriage in Talley for a John Jonathan of Llansawel and Anne Rees of Talley 17/2/1776 making them in the right area to be parents of your Joseph. Timothy Jonathan was enumerated as 67 in the 1851 census, so they wouldn't appear to be twins.
Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb