I did call customer service, and this is correct. According to the service representative, there is no way to eliminate the duplicate branch that appears in family tree view, as the program is showing the relationship as cousins and married people separately. This is highly annoying. The pedigree view also shows duplicate ancestors. Also annoying.
According to the service rep, as you build on one side, the information should fill in on the cousin's side also, as long as you select from the people in your tree when you add the information to the other side of the tree.