I think I found the brother of James, William Sly. He came on the same ship, only a different time. I found him on the Elizabeth in June 1852. The ages are about right. I don’t have any documentation that says definitely “Yes! These are the right guys!” I’m still looking for that smoking gun.
I am trying to locate the ship that William and James Sly came on from England. I had assumed that they came together in the past, however, a few pieces of information that I have gathered have made me start to think that one came and then the other one came. I have found a James Sly, all by himself on a ship: Bark Elizabeth but have not located his brother William yet.