Here is all I know-
I’m related through Agnes Marley (born abt 1877, Daughter of Peter Marley and Helen Callaghan according to Agnes’ marriage certificate in 1894)
Peter Marley was recorded as deceased at time of Agnes’ marriage but Helen Callaghan was still alive (in 1894)
The only marriage on ScotlandsPeople that could fit for Agnes’ parents was 1857 in Airdrie - Peter Marley (aged 18) and Ellen Callaghan (aged 17, Ellen’s parents recorded as Edward Callaghan, Navy and Catherine Bayls)
Then in 1913, the death of Helen Callaghan widow of Peter Marley, aged 71 (so the husband is the same and the age matches up with the age at marriage, her parents are recorded as Edward Callaghan, deceased railway surfaceman and Catherine McClarty also deceased)