Known as Kay, she was a daughter of William Henry Stewart 1880-1954 and Catherine Etta (Cassie) Potter.  Cassie's parents were Willis Luther Potter and Ellen Jane Simpson, grand-daughter of John Simpson who emigrated from Ireland to Ontario and was in the Marsville area for a short time in the early 1850's.  He later settled in Amaranth Township.  It is a different Simpson family to Katy's husband Harry's, although they may be distant relatives.  Kay is also a sister of Marguerite Stewart, the wife of Harry's cousin Glenn Simpson.  

Her obituary was in the Guelph Mercury on Monday, Jan. 9, 1995 edition, it reads as follows.

Simpson - Kathleen Mae, peacefully with family present, at the Guelph General Hospital on Sunday, January 8th, 1995.  Kathleen (Stewart) Simpson in her 81st year.  Beloved wife of the late Harry Simpson.  Loving mother of Shirley Alexander, and her husband Don of Fergus, Howard Simpson and his wife Bonna of Guelph, Helen Inglis and her husband Dave of Walkerton.  Sadly missed by her grandchildren, Marilyn Salvisburg and her husband Brett, Brian Alexander and his wife Lisa, Patty and Steven Simpson, Heather, Shannon and Lindsey Inglis and great grandchildren Shirley and Kirk Savlisburg.   Dear sister of Marguerite Simpson of Orangeville, Borden Stewart of Grand Valley and the late Ella Cudney and Isobel Campbell.  Mrs. Simpson was a longtime resident of Marsville and more recently of Guelph.  Friends may call at the Gilchrist Chapel-McIntyre & Wilkie Funeral Home, one Delhi Street, Guelph, (from 2:00-4:00 and 7:00-9:00 p.m., Tuesday).  Complete Service in the Chapel on Wednesday, January 11th at 11:30 a.m.  Reception to follow in the Trillium Room of the Funeral Home. Spring Interment Price's Corners, Union Cemetery.  Memorial contributions to the Memorial Funds of Knox Presbyterian or Bethel Presbyterian Church would be appreciated. 