Hi there,
I have just seen your post and am pleased to see you are searching for information on the very same people I am!
I would have to check my notes again, but I am also the great grandchild of Charles and Ethel Dalton. I've been looking into the history as well, and get stuck at this point. I hadn't heard about the inheritance, but we always thought there was something 'suspicious' that resulted in the name being changed from D'Alton, to Dalton.
Fyi, my family are now living in Wellington, New Zealand (apart from me, I am in Australia). My grandads name is Lionel Dalton. Unfortunately he died a number of years ago, so we don't have much information to work with.
Where exactly do you fit in?
I look forward to hearing from you about this....and I know my family will be too.
Michelle.