In the April to June 1899 birth index Gladys Maud Vickers, Wellingborough, Northamptonshire, volume 3b, page 170.

Parish Records St. Peter, Liverpool
Born April 18 1899, baptism August 31, 1903, Gladys Maud Vickers, parents George Ernest Vickers and Eliza Vickers, abode Cochrane Street, father is a joiner
[Curiously she was baptized about 5 months after her younger brother.]

In the 1901 census 15 Valentine Grove, South Everton, Everton, Lancashire
Head George E. Vickers, age 28, joiner, worker, born Wellingborough, Northamptonshire
Wife Eliza Vickers, age 30, born Liverpool, Lancashire
Daughter Gladys M. Vickers, age 1, born Wellingborough, Northamptonshire

In the 1911 census 8 Dawler Street, Everton, Liverpool, Lancashire
Head George Ernest Vickers, age 38, joiner (house), worker, born Wellingborough, Northamptonshire
Wife Eliza Vickers, age 40, married 13 years, 3 children born alive - all still living, born Liverpool
Daughter Gladys Maud Vickers, age 11, school, born Wellingborough
Son George Arthur Vickers, age 8, school, born Liverpool
Daughter Elsie Florence Vickers, age 7 months, born Liverpool