Is there a way to filter the Parentage Report (or the People List) to show those individuals that have parents but don't have a preferred parent?

I am finding quite a few people that look like they have a parent missing in the data but when I check, both parents are there - one or both are not marked as preferred.

By the same token, I need to filter for those individuals that have more than one mother or father. Usually this happens when a step-parent is in a census with children from a previous marriage. I want to remove the extra parent.

Lori