I've been doing some digging!

Sarah Annie Jaggar, born Oxford 1870.
Married (1) Alfred James Oxford, 1896, Burton Upon Trent.
Married (2) Richard Cain, 1924, Burton Upon Trent.
The executor of her will was step-son James Mylchreest Cain, MHK (died 1981).
Son: Frederick Charles Oxford (b 1899) of Kenya
Daughters:
Edith Annie Oxford (b 1901), of Vancouver, Canada
Mary Frances Gilmour (b 1903), of Liverpool
Margaret Jane Morris (b 1909), of Taunton
Georgina Ethel Nicholson (b 1912) of Basingstoke
2 Granddaughters mentioned, but I won't name them in case they are still living.
Richard and Sarah's address was "St Helena", Spring Valley.
I suspect this has disappeared under the Spring Valley Trading Estate? (B&Q, PC World, etc).
There were bequests to 3 others, including her doctor.
One of these lived in the same terrace as I do now

MHK = Member of the House of Keys; the Manx Parliament.
Local equivalent to an MP