Violet Greathead

I gathered four Violet Greatheads from the 1911 census. I can trace three of them but just who is the Violet Greathead aged 12 born in Birmingham and living with John Oswald and Annie Marie Brandreth and their son Bernard Oswald Brandreth. Violet is described as a cousin.

I have researched the Bandreth family and the Lane family, Annie Marie's maden name was Lane but cannot discover how Violet could be a cousin.

My very kind friend Teresa even sent me the census sheet to see if that gave the answer, but sadly no

Any one any ideas please?