Parents Thomas Callow and Elizabeth Terry married in Aston, Birmingham 1905. They were living on a canal barge in the London docklands in 1911 with her older siblings Thomas, Annie and George. They had to use a special census form for vessels which I hadn't seen before. The record doesn't seem to exist on familysearch.org but findmypast has it. Her father's age on the 1911 census is rather ambiguously written but I think these are correct.