Doesn't help to find Charles snr, however there is a school admission (20 Feb 1893) for Ruth BETTS, mother Alice, at Latchmere School, Wandsworth. Ruth's birth date is 6 Dec 1885.
When Ruth marries in 1906, she says her father is Charles, a waiter. (Ruth BETTS m Charles Edward GALTON 4 Aug 1906, at St Mark Islington.)
Probable in the 1939 register has Ruth's birth date as 26 Dec 1886.