Thanks for your reply. You are right on with the censuses.
Helena Welsh was registered under Welch. She was born 1875 March 6th at Somer Court, Falmouth Town, Cornwall. Parents were William Welch & Elizabeth Welch (nee Franklin).
Helena & William moved to Paisley, Renfrewshire with their son William & daughter Margaret around 1906. Helena died in 1907 in Paisley. I am trying to find William Sr. & Jr. on the 1911 Census but so far no luck. William Sr. was born 1870 in Paisley and William Jr. was born 1900 in Ayr.