Thanks for clarifying - it was just that earlier you said she was born a Tansley and that her surname didn't change after the adoption which is why I was confused.
If I've worked things out correctly, David Bertram Tansley was the brother of Frank Tansley who died in 1921 - Frank Tansley had married an Isabella Thorpe in 1919 Leicester and this is presumably the Isabella Tansley who DB married in 1929 i.e. he married his brothers widow.
I am no relation - just trying to help out on this thread if I can. Newfloridian started this thread trying to work out who Joyce R Tansley was which you have now fully explained i.e. adopted daughter of David and Isabella and that her birth parents were Frank H. Johnstone and Mary Bennett who married Dec.1939 Leicester. (Frank H. Johnstone b.1911 being the son of Andrew D. Johnstone and Elizabeth Grace Tansley who didn't actually marry until 1913).
Frank Tansley (Isabella's first husband), David Bertram Tansley (Isabella's second husband) and Elizabeth Grace Tansley (mother of Frank H. Johnstone, Joyce R's natural father) being siblings.
That seems to tie things up nicely.
Annette