Thanks joanne
I have discovered that Josiah Barnes was born in Ansley, Warwickshire in 1789 (christened 26/01/1789 at St Laurence). Other siblings include Joseph (1777), George (1780) and Charlotte (1784) with parents Thomas Barnes and Elizabeth Shaw (married 25/05/1777 at St Laurence, Ansley).
If Samuel was a sibling that would put him born in 1785, which would fit as there are a few gaps between the birth years of the siblings.
Look forward to seeing what else you can find out!
TB