Hi Gordon, thank you for that information about the sons of John. That's one step forward, maybe? to my Brindleys. With some BMD dates we may be able to link people up.
I am sure that your posting/sharingthe information that you did will be somewhat helpful to others who may have thought to themselves, as I have on occasion,I cannot get any further with my Brindley family so I will forget the Brindley line and I will go onto another branch in my tree.
I have not much to share but here is what I have.
There was a Martha Ann BRINDLEY, born C 1839, unknown where. On her marriage certificate when she married to William LEACH in West Brompton, Kensington, London,her father's name was John BRINDLEY, occupation soldier.
She had 3 children(maybe more, we know of three daughters) Minnie or Millie, Annie and Mary. They moved to Surrey. Their parents, Martha Ann and William, both died (Martha Ann of TB) a few years after the marriage, and the children went into a home and then were probably sent( they lived in Canada and the US) to Canada in the 19th C as 'Home Children'.
These three daughters were proud to be descended from the(?) brother of James BRINDLEY the engineer, and this information was passed down to the descendents, and some of the men born later, were given the middle name of BRINDLEY.
It is likely then that our John BRINDLEY was born about 1815 to 1820. He may have been in London because he was a soldier. I have been so far unable to find his marriage and even if I did find it I would have no way of knowing if that is the right one. There are a couple of 'possibles' on the Free BMD. When his granddaughter Mary LEACH had a daughter herself in 1903, she named the child 'Agnes Frances' so perhaps those names were significant.
Another relative looking for this family has a postcard size picture of 'Mrs Leach' the name is written in pencil on the back,Mrs Leach being Martha Ann nee BRINDLEY. On the back is also a word that is hard to read but looks sort of like Sher--orne? . Perhaps it was Sherborne Wharf in Birmingham but that is a wild guess.
Perhaps with some more searching I will be able to add more information to this. I do hope my little contribution will add to someone else's knowledge of their family.