Well thanks!!!

Tati, I think you've got the births of the two sisters and the marriage of the parents too. I guess I'll be emptying the coffers to get the certificates, but I definitely think they're the right ones. Thanks SO MUCH!!!
Tati, I have been in touch with the Frenchman who posted about the car, and yes, he is a real fan of Redmond!! He owns a telescope that Redmond had built in the 1930s and has been able to fill me in on Redmond's life in France (he spent much of his later years there, and died and is buried there).
Annie65115. That is REALLY intriguing about Chas Hamilton Broadwood, certainly merits further investigation. I wonder if Mary Louisa Broadwood eventually became Mrs Bartholomei?
Now I need to get all of this straight in my head! Thanks again, It really is amazing how you've helped in just a couple of hours!