Anyone ever have to call the cops on their own parents? What did you say to get the cops to take your seriously?

I don’t have a restraining order, they’re moving away in a month, so I figured the end was near, but to no one’s real surprise, they’re ratcheting up the “why won’t you talk to us?” Nonsense. My mom has very strong NPD/BPD, and my dad is the enabler, even saying in family therapy (my idea, last ditch effort at saving our family) “I will always choose my wife over my children”. I went NC just about a year ago, they didn’t accept it and at first sent letters and cards every week. I stopped opening quickly, and just dropped them in the trash. I blocked both of their cellphones right away, and they haven’t seemed to try to contact me (no vm’s anyway), until today- I get a call from a new number, and vm from my mom. She must’ve gotten a new phone, so I blocked that too. I’m expecting their next step to escalate by physically visiting me before they leave.

They both have continued to demonstrate irrationality, and I have kids, so I’m considering getting trained and buying a firearm, despite being pretty left leaning. Anyone else feel they had to go that far or am I overreacting?