Might Ethel be a bit younger than your mum?
There is a death registration for an Ethel May Fearon, born 10 July 1919, died December 1979, Liverpool.
There is also a probate record for Ethel May Fearon that gives an address 138 Hartsbourne Heights, Liverpool.
There are a couple of marriages, Ethel M McMillan to James H Fearon, Liverpool 1941, and Ethel M Simpson to William F B Fearon, Liverpool 1938 (I wrote this before seeing your post about Fearon being a likely maiden surname)

Barbara