It is odd that I was trying to sort this family out. I have most of the Fox family - being connected to it through marriage - but I didn't have Barbara. Several on the internet have Thomas & Barbara, but I wasn't sure how accurate they were. Most of them agree with what you mention, so I guess we can go from there. It would appear that Barbara died about the time of the birth of twins - would you know if that is right ?
I don't know how much info you would like - since the search is part of the appeal of genealogy - give me some idea & we will go from there. You can reach me at firstname.lastname@example.org if you like.