Thank you so much for all that information, cupoflife. That has given me a lot to go on. It's interesting that the children maintained contact with their mother, even though she was the 'guilty party' in their parents' divorce. I'm still wondering whether they were adopted or whether they just chose to change their surname to Roberts. I guess my next step is to get an An****ry account to try to find the births of any grandchildren, unless anyone can suggest another option. I have tried the 'Ask a Librarian' service for possible information about State care and adoption but so far (nearly 3 weeks) haven't received a reply. I'm sure they have plenty more pressing things to do so I don't have high hopes for that. On we go. Best regards.