Hi Helen
Yes, it would appear that William's father was named Thomas and James' father was named William and they were both the sons of James Robins and Susannah Cornford.
William and Barbary's son was Thomas William Robins born about 1834, and there is a marriage listed for a Thomas Robins to a Harriett Brook in Hailsham in Dec qtr 1854. There doesn't appear to be any corresponding Robins family in 1861, BUT there is a Brook family living in Eastbourne who are very probably the same couple. Harriet seems to have lost several years off her age, but other than that....! It looks to me like Thomas took his wife's surname at their marriage.
So, if I've worked things out correctly, the only situation that makes sense is that Thomas Brook was the son of Harriet Brook and Thomas William Robins and therefore Thomas Brook was the grandson of William and Barbary as shown on the cenuses.
With Thomas being born there, and William and Barbary dying there, I think the Hellingly workhouse must have been sick of seeing the members of the Robins' family!
William and Barbary Robins were my gggg-grandparents, so Thomas Brook would have been the cousin of my gg-grandfather Samuel William Robins, born in Hailsham in 1862.
And yes, I am the Glen Robins from Ancestry. The Robins of Sussex tree is very much still a work in progress, started after I bought a book called "The Robins or Robbins Family of England" which had only 1 person named Robins to cover the entire county. I thought I'd try to put the record straight!
(Does any of this make sense?)
Regards
Glen