Looking at son, Edward.
You know he was born Jan 1885 (see christening in Camberwell I found earlier)
He was still alive in March 1890, the date of the christening.
He is not with the family in either 1891 or 1901, the family still in Camberwell.
So, from freeBMD (you can search this for yourself, it is free), this looks a very likely death fr him :
Jul/Aug/Sep 1890
Camberwell ref 1d 550
Edward Crowe age 3
The age is not accurate, but we all know how easy it is to mistake a 5 for a 3!
Given all the other evidence I think this is a good possibility for his death, dont you?