The certificates arrived today. The new online service only takes 4 days instead of two weeks, and it’s cheaper, because you don’t get a physical piece of paper – only a PDF.
The two children (one who died and one who lived) were not Grace and William’s children. They were born to a different Wright who married a different Trinder and just happened to live near enough to where William had lived with Grace – weird coincidence, but these things happen.
The other child, Peggy Trinder, was Grace and William’s child. Here are the details from her death certificate.
The death certificate shows that she died on 4th January 1929, at 5 Merrybower Road. Her name was Peggy Trinder. She was a little girl. She was one day old, and was the daughter of William Thomas Trinder, whose occupation was “commercial traveller,” (the same occupation Dennis had when he enlisted in the army).
The cause of death was listed as prematurity, and no postmortem was performed (no PM). This would usually be because the cause of death was obvious to the doctor, and a post mortem wasn’t needed. W G Trinder was in attendance at the death, which happened at home, and the death was registered on 4th January (the same day she died).
The birth certificate can’t be requested as it’s from 1929, but this contains enough information to show that the “red haired girl” remembered by Patricia’s mother was, indeed, a sibling, and that she died at home, of being premature. Grace was, at the time, 43 years old.
The death certificate also gives another address for the family in 1929, of 5 Merrybower Road in Salford. This is a suburban street, a short distance from Clowes Park. The house is semi detached and still standing (image from Google Street View).