Hi Kirsty,
Was Violet born in 1911?
If so, then the 1911 census seems to show that she had a brother Thomas born ca. 1891 and a brother David born ca. 1897 (as well as other sigblings born after 1901)
Do you have the 1901 census yet?
1901
RG13/4466 55 1
Sculcoates, Yorkshire
5 Spyvee? Street
Thomas Langthorpe, head, 35, General Labourer, b. Yorks Keyingham
Rachel, wife, 31, b. Norfolk Kings Lynn
Thomas, son, 10, school, b. Yorks Hull
David, son, 4, school, b. do.
Herbert, son,1, b. do.