Thank you so much for your replies. I found out that Margaret Jane Hudson and John Thomas Hudson had 4 children all of which had died but it's so interesting to know their names. I had not been able to find a death for John so that is a great find I will look into getting a copy of his death certificate.
How would I go about getting a copy of Montagues will? I am really starting to think that Montague is my grandads father but can never place him and Doris together in fact I can't find where either of them lived in the 1930s 1940s. I know they lived in Oxford together when my grandad was around 9 as this is the age he thinks he was collected from foster care and taken to live with them.
During his time in foster care he remembers Doris coming to visit him but always knew her as Auntie Doris it wasn't until he was taken to live with them Montague told my grandad that Doris was his mother it was then he was told to call him father. When my grandad was going to join the army around 18 years old he was told that Montague had adopted him to carry on the family name. We have no adoption papers so have no idea when this adoption took place.
My grandad had no birth certificate so the one I have was done in 1959 when he would have needed it to get married.
He only once asked his mother who his dad was later on in life but she would not tell him saying he would not forgive her.
My grandad knows that his last foster home was with a Mr and Mrs Todd he stayed with them for a good few years they had children Ada, Homer and another I don't know. He remembers them living at the level crossing Woodstock in Oxford. I think maybe they were friends with Doris as they did stay in contact.
I also can not seem to find out what happened to James Morton.
My grandad says that although Doris did not talk of her mother much she was alive through some of my grandads childhood he says that Doris went to her funeral and that she was killed by a tram however I can not find anything to say this is true. So he may have that completely wrong as he did never meet her.
I will deffintly contact Barnardos
Its all such a mystery but thank you again for your help you are all much better at this than I am.