I'm hoping that Sarah's father wasn't Isaac Preest the cattle dealer/farmer as he married Louisa Jenkins in 1843. Their son Thomas Grantley married Sarah's daughter Charlotte Robins in 1878. Which would mean that Thomas married his niece.
It's such a shame that the 1841 census didn't show whether each person was single, married or widowed. I'll delve into the Heath family at Quarry Arch, to see if I can figure out who they are.
Thanks
Mary