Diana,
You have posted this question in the Feature Requests forum. You might do better if you repost it in the Technical forum.
And when you do that, I would like to suggest you give some concrete examples. My hunch is that somebody is not attached properly in your tree, but nobody can check whether this is a bug or a problem with your tree if you do not give the names of the people you think should be connected and also be marked with that particular color line.