Hello and welcome,
You may already have this.
Free BMD shows a marriage for Joseph and Muriel in 1959.
I can’t see any children’s births.
There is a death in 2002 for Joseph.
I cannot see one for Muriel.
However there are cemetery records for Tameside Dukinfield Cemetery Section C3 grave 481 which show That Muriel died in 2010.
There is also a Mary Callaghan b 1909 and buried 2004.
The site is very slow for me - whether this is normal or not I don’t know.
http://web.tameside.gov.uk/BACAS/GenLocDetails.aspx?ID=1043I hope the link works.
It might be worth requesting the local paper for help.
Best wishes
Heywood