ozzie wrote, "I can say the newspaper clipping is definitely not the Mercer-Sullivan who were my ancestors. "
I'm very surprised to hear that! The husband's name is quite unique, and Kathryn's sister Nellie and her husband lived in that area. What about the couple in this clipping makes it seem an unlikely match?
I am absolutely certain that the groom mentioned in this clipping is the Oscar O. MERCER who died in Seattle in 1935, leaving wife Kathryn, daughters Grayce Sharpe and Mrs B.C. Cadden, son Charles, and a brother named William.