I have a Netgear Nighthawk AC1900 Cable Modem Router. Is it possible for someone who is very computer and network savvy to gain access to the information on my MacBook Pro just by knowing the MAC address of the router? Background: I have a family member who is a Microsoft expert and works IT for the military, specifically a help desk where he assists with computer issues remotely all over the country. He always seems to know way more about my personal financial information than he should. I have had financial information disappear from my hard drive and often have difficulty navigating around my computer. By that I mean that programs will often resist shutting down, my cursor will become difficult to control, or the computer will resist shutting down altogether. It’s as if the computer is being taken over. It’s obvious to me that I am not the only person using it at certain times. I live alone and there is only one computer on my network. I have checked the running processes but nothing appears off. I have investigated every application that shows up in the list. How is he accessing my data?