Thanks to Alan Taylor, I have some information that others might find useful. If anyone can fill in any of the blanks please let me know.

My grandfather is Gordon Highlander Edgecomb.
He has (had) 9 brothers and sisters.
1.Winifred
2.Mildred
3.Gordon Highlander
4.Victor
5.Howard Gault
6.Georgina
7.George
8.Dorothy
9.Doris
10.Charles

His father was Charles Taylor Edgecomb, who married Elsie Winnifred Ashdown.

Anyhoo, there's more info if anyone wants it.