« Reply #3 on: Sunday 31 January 16 20:26 GMT (UK) »
there's no marriage for a Mary Kinsman & William Francis around the right time in Cornwall, and there's no baptism showing up in the 1777 either. I've checked the opc database, FreeReg & the Cornwall Family History Soc indexes.
There is a marriage of a William Francis & Mary Williams 29 May 1796 in Redruth St Uny which fits the timeline of the children baptised to William & Mary Francis.

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