I live near Strathroy .. and the Parkhill Gazette is also on micro-film at Strathroy library..... so I had a look.
I was looking for a longer obit .. like was sometimes put in papers .. but couldn't see any for your Gagan family. I did see a couple of small ones ... like in the attach .. for Mrs James Gagan from the Thurs Sept 24 1925 issue of the Gazette.
Strathroy lib. also has books for all the cemeteries in Middlesex county, and I see that James and Bridget are buried in Bornish R.C. cemetery in West Williams township.
Sorry I couldn,t find more.