1) I have been threatened with swatting ALOT lol.
99% of the time They couldn't even obtain accurate information.
2) They can actually dox through mediacom, but from the sounds of it the internet account is in your PARENTS name. Meaning when he calls up mefiacom pretending to be you, dropping your info as an account holder he will look like an absolute fucking moron.
3) With the amount of swatting a few years ago, when you show the cops the messages they'll track his dumb ass down and it's his ass not yours.
4) Just calm down, explain to him that if he is going to swat you to do it and shut the fuck up about it. If he keeps talking about it just laugh at him cause he's being a pussy and trying to extort or scare you bro.