This is a bit weak. He had to maintain residency to be a Senator of PA. He was paying taxes on the residence that is not questioned. His kids used a cyber school which does not cost the thousands of dollars suggested to maintain. Anyone that thinks this is going to be an effective attack is really dumb.
It cost the district thousands in tuition. Do a search and see what the tuition cost is - last year it was about 11k per student charged to their home district. The home district for students is "where they sleep" - PA has had court cases about district residency.