Hi Lynne,
As far as I am aware, William (Bill as my grandafther knows him as) had a sister Florence (Florie) and Patricia, although regretably Florie passed away, and of course my grand father Joseph.
Their Father was a William Revitt, and Mother Beatrice Townsend. William was born in 1979 according to my latest bit of work, and his father was named Richard (a bricklayer, living at 113 Church STree, Walsall in 1881, born approx 1957). William's mother was named Eliza/Elizabeth, although I'm not sure of her maiden name. I do know though that when Richard passed away she lived with his brother Alfred for some time as they were close.
Beatrice Townsend was the daughter of Thomas Townsend and a Mary, although I'm currently trying to find out the origin of this link - I have a hunch they were part of a family living in Yorkshire (near Shipley).
William Revitt also had 6 sisters and 5 brothers - Alfred, Richard, Joseph, Thomas, George, Elizabeth, Martha, Mary, Bella, Emma and Patricia.
I hope this perhaps shed a little more light on your father's family links. If you have anything extra, please get in touch.