From the Irish Times 22 December 2021:
WATERSTONE, Gay (née Butler) (Valentine) (Jamestown, Co. Leitrim) - December 20, 2021, peacefully, at Lough Erril Nursing Home, Mohill, survived by her husband Desmond, sons Simon John and Harry Desmond and her grandchildren Eric and Elena [….]
WATERSTONE, Gay: Death : Irish Times
She was the d of Cdr Terence Brinsley John Danvers BUTLER RN (1913-1987), scion of the extinct Earls of Lanesborough, being the son of the 3rd s of the 6th Earl, and his 1st w (m 1937, div 1947) Hermione WILLIAMS. She m (1) 1964 (div 1973) Arthur Clyde NICHOLSON and had a dau Felicity b 1969 (not mentioned in the notice) and (2) 1975 Desmond WATERSTONE and had 2 s as above