Hi, I was really interested to read your message, as I have recently been researching my Grandfathers family - Arthur Dilks Westhorp - who I had believed to be an orphan. Grandpa was a wonderful man and very important in my early years, but unfortunately he never spoke about his early life, maybe it was just too painful.
I have discovered that - Arthur Edwin Westhorp - (his Father) died in 1889 at the age of 34 and was an engineer (from my Grandfathers marriage certificate).
I have a photograph of my Grandfather with his two brothers, one who I believe to be William Hast 1886 - 1917 and who died as a lieutenant in the first world war and another brother Robert ( I think ) , who may be your Grandfather, but I have not been able to find much about yet.
Also my Grandfather may have had a twin sister but I am not certain of this yet.
I was surprised on hearing about Alice and believe that she later changed her name to Westhoven. Also amazing to read from you about Arthurs behaviour , as it is so difficult to imagine what had happened and was most interesting.
Anyway, I hope that this has helped a little.