Hi Rosie, I can only assume that Maria is the birth mother of Francis as I have no confirming evidence, this is all complicated by Maria's marriage to Abraham then James, all I do know is that Francis went into being a clockmaker with James servicing Kensington palace as a Clockmaker to the Queen and Royal household, James held a Royal Warrant, they lived apart in the 1851 London census although a few houses apart.They both died in 1856 and are buried together in the same plot in the Kensal Green cemetery. The 1851 census notes Francis was born Kensington Middlesex.
Francis married Harriet Brough 4/12/1841 at St James Westminster they had 7 children, this is my ancestry- however who is Francis's blood father?.
Cheers,
copper john.