A good point to discuss. Of course it's handy to straighten out the children in the biographies. But sometimes people aren't sure about when a given spouse died or was divorced, so it might not be clear which child came from which marriage. But you still have to assign them each some set of parents. Now I do believe that depending on which profile you're working on, a different set of children or siblings will appear. Thus if your grandfather Charles had two wives, Amy and Barbara, if you're looking at Charles, all his children will show in the children area and likewise for Amy and Barbara, so if the connections are right, in the profiles, you should be able to figure out who is whose by comparing the A, B, & C profiles. So I suspect the only reason for not displaying by spouse is that it will take up more space at the top of the profile.