I also post as envisage1.
According to 1901 census in England, Sydney Axten is listed as 16 y/o stepson to Celia and Harry Johnson/Johnston. Birth certificate shows mother as Celia, but no father listed.
Sydney had a sister, Gertrude, who was older and not listed in household in 1901. Unfortunately, Gertrude was a popular name and I do not know if she married and if so, what her name was then.
Thanks for any help,