I can't find any other children but it's not easy to search because the mmn is being spelt a number of different ways.
I can't add many more details to the censuses because I can only see the transcripts not the scans. George was listed as a gardener in 1901 and a railway porter in 1911.
Seem to move around a bit because the children's births are listed as Hockley, Handsworth & Vauxhall.