It looks like I'll have to be patient and wait for the 1921 Census online to be published in January 2022 to hopefully see where 6 year old Edna is living and with whom. In the meantime I would like to follow up on the possibility that Edna may have been adopted/fostered by Hugh T and Lydia and who may have changed her birth surname to Williams.
A great percentage of husband, David's DNA matches have the name Cain/Caine from the Isle of Man and some from Liverpool. Now this is a very long shot and I may be clutching at straws but I searched for birth/baptisms with the surname Cain(e) and found these results:
FreeBMD Births Jan/Feb/Mar 1915 Lancashire
Cain Edna mmn Cain Toxteth P. 8b 430
I also searched ManxBMD.com using both Cain/Caine. with and without forename and forename only without success.
However on FindMyPast Lancashire Baptisms I found an Edna Caine with our Edna'a exact birth date!
Lancashire Baptisms Aigburth, St Anne, Church of England Liverpool
Caine Edna
Birth 20 Feb 1915
Baptism 07 Mar 1915
Residence 1 Amphtill Rd
Father Albert Graham occupation Confectioner
Mother Jane Elizabeth
Liverpool Record Office Archive ref 283-AIG-2-1
I would like to explore this family further to see if any of their names match with those of David's DNA matches, however I can't find a marriage for Albert Graham Caine and Jane Elizabeth - or a birth registration for this Edna.
Margaret