It looks like Joseph was married before, probably to Mary Partington. It's a bit dificult as two Joseph Hiltons, both married to Marys, are having children in the same area. But the names on the 1851 census, when compared to the birth records, suggest the name Partington to me:
Marriage: 4 Oct 1829 St Leonard, Middleton, Lancashire, England
Joseph Hilton - Weaver, this Parish
Mary Partington - Spinster, this Parish
Witness: Edmund Collinge; Richd. Kenyon
Married by Banns with consent of parents by: Jacob Picton Curate
Register: Marriages 1825 - 1830, Page 250, Entry 748
Source: LDS Film 1545701
Mary seems to have died in 1840 aged 30. Joseph is alone in the 1841 census with children Abel (Abram in baptism records and probably really Abraham), b. 1830, Rachael, b. 1834, Thomas, b. 1836 and Ann, b. 1839. There were also children who died. Rach(a)el pops up again in the 1851 census with Joseph and Betty. The marriage entry in the parish registers shows that Joseph was a widower when he married Betty Broadley on May 6th 1844. His father was a farmer named Abraham Hilton.
It would seem that Betty also had a child before she married Joseph. A Charles Wright Broadley was born in 1842 in Chadderton and a Charles Bradley in 1843. One of these must be the Charles living with the Hiltons in the 1851 census and listed as "son".
Hinah/(H)Ino seems to be listed as John in the 1851 census. Does my theory need rethinking? My nephew's name is Jonathan and he is never called anything but "Jono". There were quite a few Jonathan Hiltons around that time in that area. Mmhh.