Kate's background is a mixed heritage: "An untitled royal bride, she has a mix of middle and working class heritage, descended from a family of solicitors and landed gentry on her father's side and butchers, plasterers, road sweepers and domestic servants on her mother's.
One of her mother's relations, James Harrison, was a coal miner in County Durham in 1819, the year that Queen Victoria was born.
There is also a jailbird among Kate's ancestors.
Her great-great-great grandfather Edward Thomas Glassborow, who is related to Miss Middleton's father Michael, was an inmate at Holloway Prison in London in an entry in the 1881 census, according to Claudia Joseph's biography of Kate."