In sources, add ID# to names.
In the attached example, the son and the father have the same name. The same source was used twice. Both source were attached to the son, once correctly as the son and once incorrectly as the father of himself.
James Mitchell K887-QJJ: Father. James Mitchel 9M3B-138: Son.
I realize it is possible for more experienced users to figure out which source is attached wrong, but those of us less experienced, having the ID# next to the name would make it obvious. And, adding the ID# would also help identify any other errors.