Hi Dinkey. A few late comments!
I too tried to find them in 1911, but like everybody had no success. I noted the observations that the family certainly moved around, which as a retired Builder I would expect that of Richard as a Bricklayers Labourer, who has to follow the work. He cannot jump in a car and go 5,10 miles or so every day, and as the Labourer he is expected to set the job up for the Bricklayers at day start, scaffolding, bricks, mortar etc in place.
The wide range of Birth locations obviously suggests the family are with him, but any short duration jobs make it hard to get settled accommodation, hence adding to the difficulty of being on the 1911 Census.
They will be there but could be anywhere I am afraid.
Cheers.