Diana
Thanks for the reply, I've recently done a check of nearly all Piddington Hillyards as the baptism of my gg gfather Thomas Hillyard (b about 1803 Piddington, later moved to Harbury, Warwicks) couldn't be found in the Piddington registers, however, a nephew John Hillyard was living with Thomas's family in Warwickshire in 1861, so as he was a Hillyard, his father would have been a brother of Thomas. As a result I had to make sure I got the right John H and checked out every Hillyard family I could.
I found that John's father was Charles Hillyard, mother Mary, and Sandy kindly found Charles's baptism in 1800, parents Samuel & Rachel, so "my" Thomas must share the same folks! They also had daughters Sarah Ann in 1802 and Ann in 1806 and at least one other son William baptised in 1815.
I also found 2 other male Hillyards, Andrew and James, born around 1795 -1800 in the 1851 census. I was hoping one or other may have been off-spring of Samuel & Rachel, but as you found out they had different parents. Still if we were able to go further back I'm sure all these Hillyards would eventually share the same line somewhere!
You mention James Hillyard married Elizabeth Shrewsbury in 1817, then Lucy later (she appears in 1841) , but by 1851 James is a widower again, and I noticed a Jane Shrewsbury is shown as housekeeper, and then in 1861 as James's wife, so it looks like he married 3 times, and twice to a Shrewsbury !
best wishes
John