I have a daughter with my previous wife. When I entered my current wife, she (the current wife) was placed between my previous wife and me, with the result, that my daughter now has a direct line from my new wife down. That looks wrong and silly.
How to solve:
Always keep couples with children as close as possible together. If it is more than 2 couple pairs (one left, one right, one ???), maybe you can use color for the lines to better mark the relations.
Thanks XooNooX, We appreciate reporting this problem and we appreciate even more your suggestions for a solution. We are aware of the problem and we already put some thought into a different representations of similar situations. Watch this space. :)