On a more serious note, I think it is a flaw in GenoPro's data model to allow connection of a pet to a family via a Pedigree Link as a chid (or even as a parent!!). Far better to use a Social and/or Emotional Relationship instead, but unfortunately relationships cannot be associated with a family.
A report script should be able to loop around the Children collection and find only children, not pets as well. If they are to be connected in this way, then a separate collection is required.