As it says above, she was stepmother to the late David, but his death is not yet recorded in the 2019 Debrett's:
Coote David (Killaloe, Co. Clare and Brittas, Co. Dublin) - April 2nd, 2015, peacefully, at Milford Care Centre. Beloved husband of Joy, father of Susie and Linda, loved stepson of Joan, brother of Deirdre, Sheila and Jennie, grandfather of Isobel.
Private cremation has taken place. Service of Thanksgiving at St. Flannan’s Cathedral, Killaloe, on Tuesday, April 7th, at 3pm. Donations, if desired, to the Alzheimer’s Society of Ireland.
Date Published: Thursday 2nd April 2015
Date of Death: Thursday 2nd April 2015
https://rip.ie/death-notice/david-coote-clare-killaloe-241063David Brian Coote, born 1942, son of Michael Henry Coote, of the Coote Baronets.