Larry, funny you say the Colliers, Jackson and Crennans being related, because we've also had the name Brennan in the mix of Colliers and Butler. I agree that there is a lot of sheep following. That's what I find on Ancestry. I'm careful about 'claiming' anyone. I had someone in Australia also researching this line. (I'm in NZ) We researched for years. Before the Julia and John marriage info was online, my friend went to the parish and did the research the old fashioned way. AT the parish of Muckalee she found the baptisms of CAtherine 1802 and Judith 1804 Jackson naming the parents Thomas and Mary, then there was the marriage of John and Judith. It was gutting to not have their parents listed though. Only the witnesses. As well as our Jackson link, we are trying to connect the Butlers. Two Jackson sisters married two Butler's. But we haven't figured out the relatlionship between the Butler's. Elizabeth Jackson married James Butler and on their son Thomas's death certificate, (Australia) the informant was Tobias Butler, cousin. The signature is a good match to my Tobias. Then when my Tobias died, the informant was Thomas Collier, cousin. So they are definitely linked together.
I agree that if Julia married twice then surely she would have been Julia Butler.