Hi,
Isaac Truefitt was born on 30th March 1799 in Staithes, and was baptised on 4th April 1799 - the son of William and Eleanor (I *think* that her surname was Burton, but that's going on information provided by other people, as I need to go to the North Yorkshire Record Office at some point to verify).
Isaac married Ann Craddock on 4th March 1821 in Hinderwell, and they had (at least) 9 children:
William, Ann, Mary Hannah, Eliza, Rachel, Isaac, Susan, Burton and Jane Elizabeth.
Ann married Thomas Watson Shaw, and their daughter, Elizabeth Ann Shaw was my Great Great Grandmother (she married John Gowland).
Also, Jane Elizabeth married William Bowering Harwood, and their daughter, Sarah Ann Harwood married the son of John Gowland and Elizabeth Ann Shaw, Thomas Gowland - my Great Grandfather).
Anyway, let me know what you're trying to find out, and I'll do my best to assist - I've got all the marriage/death certificates for Isaac and Ann's children.
Cheers,
Nick