|If you suspect you have been hacked the only solution is to wipe and reload the OS on the PCs and Macs.|
Doing anything less will result in leaving hacker backdoors in place.
What you describe is not a professional hacker. They would have come and gone and you would have been none the wizer.
Consider replacing your router with one that contains a robust firewall.
Practice safe computing. They got in because they were invited [you went to a web page/got a virus/malware infection/didn't keep up on service pack updates/weren't running a software firewall]
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