Youngest, George was born 1850. So, theroetically, should be with Charlotte on 1851 Census.
On the ancestory index I can see mention of :1841 Charlotte
1851 Charlotte
1861 Charlotte with a William Hedges - you have found this one
1871 Charlotte
You need to make a separate posting asking for a look up for these three census. Sorry, i don't have access myself. In the meanwhile, on the 1861 census - what did it have as her marital status?
It could well be that she never married. However - last child was born 1857. So there is also the possibility that if she did marry, he could have died by 1861 census - hence not showing up.
So, as well as checking out these census you will need to order certs. Personally I'd go for Julia's birth first. Julia's marriage should mention a father - but I have found in the past that sometimes paternal information is not accurate. Births better, but still not 100%. Let me know how you get on. Regards KA