Hello, me again.
Emily Florence, as you may know, was born February 1857 - the third daughter to William and Jane. The other two daughters are Mary Jane (or Polly, born in 1852) and Frances Caroline (or Carrie, born August 1854). As Emily and Jane both worked closely together and with their parents, you might find the children in another family member's household on census nights. Emily and Henry's son Harry even ended up living with grandparents William and Jane Deville, and became known as Harry Deville.
Int his case, however, William and Jane are with their children in the 1861 census (now including son William) in Dalton-in-Furness - their surname is recorded as Macarte - as Valda identified in an earlier posting. I think the William and Jane you have might not be the right couple.
At the time Emily Florence was born, the Cliftons, Macarthys and Devilles were working for Joseph Henry Wolfenden who was a lessee of the Queen’s Theatre in Hull. You probably know that in 1877 Emily Florence married Alfred Wareing.
My cousin who has done a lot of research into the Macarthy side is related to Emily Florence's older sister Mary Jane. I'm afraid I am not really at liberty to make her research public (sorry), but I will drop you a line (assuming I can contact you through RootsChat).
Erica