*A quick update*
With that information I've found both Agnes (Maiden name Croan) and Walter Browns children registered in Indiana.
Ellen [Eileen] Brown born 1929 and William born 1928 - both were born in Scotland. It looks like they had a younger sibling too Maureen Brown born 1931 also in Scotland.
Thanks again Mary - this part of the family is very interesting based on Eileen and William's involvement in WW2. My Dad has a copy of an Egyptian paper from D-Day that Eileen sent home. That newspaper is pretty much the only thing I've had as a concrete fact until now! However I'm just going to do a little further digging because their years of birth wouldn't match up with the family stories unless they were very young possibly lied about their age) and only served right at the end of WW2.