Lucy McAveston and Golam Mohamed were married in Greenock in 1921. If you compare the parents listed on that marriage certificate with the parents listed on the death certificate mentioned above you will know whether or not he is the same one.
Patrick Burke married Lucy McCavisten or Clark or Mohamed in Glasgow in 1957. That marriage certificate should tell you whether Lucy was widowed or divorced. Also, perhaps, where the Clark came from.
Lucy McCavisten or Mohamed or Burke died in Glasgow in 1962 aged 67.