Hi, and welcome to Roots chat.
If your father-in-law is still alive, the Moderator will probably remove his details from your post.
Is it your private tree on Ancestry (k bowman family tree)? The birth date of Norma is given as 1929, which would appear to be correct, as there is not a birth in England & Wales for a Norma Valentine in 1925.
Norma Valentine
Born June 1929 Manchester North
Do you know where Norma was in 1944 & 1945? There are several births with mmn Valentine during those years in the following places:-
Brighton
Bedford
Nottingham
Wrexham
Blackpool
Oldham
I can't find any other information on the mother and baby home I'm afraid.