I have been waiting for this census since 2005. DM asked me to look on the internet and find out whether her father had children from his first marriage, as she was convinced she had a memory of her mum (who was extremely secretive) talking to a man called Jack about his father.
Sadly, my grandfathers whole family was missing from the 1911 census, but on the 1921 census he is there, and there are 4 children from his first marriage, including a boy called John, who would probably be known as Jack.
Interestingly, by 1921, grandfather had moved right from the North of England to the South West (where he later married by grandmother). His first wife in the north, had entered her status as "widowed" but it had been crossed through with a blue pen and "married" added.
So I am now wondering whether grandfather actually got a divorce or if he married my grandmother bigamously.
Unfortunately, I cannot tell my DM this news, she would have been so excited, as she now has advanced dementia. This whole search has sparked a 15 year interest in family history and I am still compiling bits of the tree, when time allows.