Can you help to identify these four siblings?

This photograph of four children, who appear to be siblings,

has the date August 1913 written on the back, along with the following information:

Lionel 13 and a half, Ralph 11 and a half, Faith 4 and a half, Constance 2 and a half.
Their surname is not known. Looking for identification of the family.

The ages would give birth years of approximately:

Lionel cir 1899/1900
Ralph circa 1911/1912
Faith circa 1908/1909
Constance circa 1910/1911