For some reason the emails I send to the address you've left get sent back saying that it doesn't exist, so I hope you get this reply via genforum.
Robert is also my mum's grandfather and she's also called Catherine Manuel after her grandmother, I have a feeling that you might know my mum, your parent's definitely will! She's Catherine McKune. I'd love to exchange some information with you, my mum has given me a long list of her cousins names, but no dates and there does seem to be about half a dozen Gerads and Catherine Manuels in there! I've got a lot more on the family since I posted the information on GenForum. I'd love to see what you've got on the family, you might have a better idea about your mums cousins than I do, do you know anything about Robbie's family in America? I'll get a new copy of my descendant report prepared for you, I now have the family one more generation back, 13 of them arrived in Scotland about 1840 and lived on the same street, I've got a copy of them all on the 1841 census and several birth, death and marriage records.