Only 2 possible Alfred Edward Westbrooks - one born 1886 Lambeth and the other 1901 Kingston. I doubt the younger would have served in WW1 so would appear to be the one born 1886.
Alfred Edward Westbrook married Edith Gates 20/2/1909 and they had just two children:
Edith Maud b.1909, d.1927 unmarried
Alfred Frederick b.31/8/1913, d.1999 Dublin
Alfred Frederick = (1) 1939 no issue and appear to have divorced
(2) 1949 Lambeth
There was one daughter from the second marriage who, like her father, appears to have married twice. She's now living in Hampshire. As I can't mention living people by name on this thread I will send you a PM with her latest address on the electoral roll.
Annette