Hope you are still interested in this line - its been a while since you posted.
I have a Frederick Rackcliff b 1874.in the 1881 census he was living at 3 Shaftesbury Mews, Kensington.His father was named Henry and was born in Herts, his mother, Hannah, was born in Eribstock, Denbigh, Wales, and he had three brothersJames, Alfred Edward, and Henry, he alos had a sister named Mary Eliza (Lizzie?).
Curiously his grandfather ie Henry father, was named Benjamin!!
There seems to be lots of information here that is similar to yours.Do you have a marriage cert for Frederick?