MacBook Cursor Jumping?

My parents recently purchased a MacBook and I’ve been doing some over-the-phone “tech support” for them with some of the stuff that apparently even Macs aren’t user friendly enough on. They’ve been complaining about the cursor “jumping around” on them in the middle of typing in Word, Mail, url’s in Safari, etc. Over the phone, I have been telling them to just type with proper technique as their palms/wrists are probably just brushing against the trackpad… but this weekend I drove down to visit them and when I checked out their computer, found out that it’s not the trackpad… and it’s really annoying because in the middle of typing a sentence, whatever you’re currently typing inserts itself into a previous line.

All of tech help articles I found through search seem to assume it’s user error. Does anybody here have a solution?