To summarise:
Alan who died in 1981 is buried in Salford with Brenda.
https://www.findagrave.com/memorial/276079583/alan-carrThe second plaque on the memorial mentions William and Milly [Mildred] Renshaw who married 1931, parents of Brenda Renshaw b1933.
Carr and Renshaw married 1954, Salford.
The first child of Carr and Renshaw was registered in 1955.
Carr and Redfearn married 1954, Manchester.
The first child of Carr and Redfearn was registered in 1955.
(Lesley Florence who d 1968, buried at Gorton, Manchester.)
All the Carr/Brenda Renshaw events were in Salford.
All the Carr/Kathleen Redfearn events were in Manchester, until the death in Dwyfor.
Kathleen remarried 1964 to Battle and had 2 more children.
She died 1977, buried at Gorton (with her parents and daughter).
https://www.findagrave.com/memorial/136522248/kathleen-battleAlan from Manchester may well have remarried, but not to Brenda Renshaw. Brenda remained married to Alan from Salford until she was widowed in 1981 and is commemorated with him.