Yet another interesting evening, searching through the other Fenn family which, as I said before, unfortunately doesn't seem to be connected to the George Manville Fenns.
William Fenn came from Suffolk - I can't see him in the 1891 just ahead of his marriage to Charlotte Bussell, but I assume he must have come to Kent as that was where they married.
They had Ada Constance in 1899 as we have already discovered, and although I can see Charlotte and William in the 1911 in Folkestone, I still haven't found the 11 year old Ada Constance.
So far, I 've not been able to follow all of William's family, but Charlotte's mother, Susannah, was dead by 1911 so Ada isn't with her. Charlotte's other siblings seem also to have died with the exception of her sister, Edith Annie, who married a Mr Thomas Crust in 1885.
They had a son Frank Hubert T Crust, born c 1885, and the family is in Folkestone in the 1901. Thomas is a printer's foreman.
Frank Hubert T marries in Putney in 1910, and by then is an actor. And I can see him coming back from the US (although, frustratingly, not actually going) in 1923, still describes as an actor. He will be our Ada Constance's cousin.
I can't see either Frank Hubert T and his wife Mabel Ethel (nee Richmond) in the 1911, nor can I see (at present) his parents Thomas and Edith Annie. Which is irritating, because that is presumably one place where Ada Constance, aged 12, could be staying.
More searching required.
My own ancestry comes from Kent, and I keep expecting to see one of my relatives turn up in this search.