Hi Cathy
I've assumed, as you sent your message via the Lancashire board, that the six people listed are all from Lancashire. I've had a look through 1851/61 in Lancashire for a combination of brothers Joseph/Edward Hilton (with +/- two years on year of birth given for Joseph) but without any success.
I've searched for William/Mary Foster in 1861 but again no joy - any idea where/when they married?
George and Elizabeth Walden are similarly elusive - I searched on +/- five years of 1811 because Walden is quite an unusual name, or it was back then, and there were only 6/12 right across England for the 1841 to 1861 censuses and none at all living/born in Lancashire.
Have you any idea where any of your GGGs were born or where they may be living in 1861? I'm happy to have another stab at this if you can provide any more detail.
Best wishes
Marie.