Humfrey,
I'm Diana's kid. I found your thread while searching for information on her brothers, Humfrey (your father) and Oliver. I knew your grandfather and mine, T.H. Welsby, slightly when I was young -- after growing up without him in her life, Diana was able to get in touch with him circa 1958 or 1960 after coming across his name in the phone book (!). He lived well past 1960 -- I can't remember exactly when he died, but I remember his moving from Menlo Park to the San Diego area circa 1968, and he lived well into the '70's. (I have to confess I wasn't too fond of him -- he was a controlling type, and ended up disinheriting my mother when she -- well into her sixties -- refused to go along with what he thought was proper behavior.) Our grandmother, Winifred, lived near us in California while I was growing up, but I don't think there was ever any contact between the two of them at that stage.
Diana died in 2002. She would never talk about her brothers, for some reason. I'd be grateful for any information you can give me about them. I know they were both in the military during WWII, and that they both died in 1954, but I know nothing about how it was that they both died so young. I do have some pictures of them as children and young adults which I'd be happy to scan and send you if you like.
I was sorry to hear that Peter passed away; I did meet him when I was 11 or so, and remember him as a happy kid. Did we meet then, as well?