No New Iphone, etc...
I wouldn't be upgrading my phone, buying my new 82 inch 4k TV, (to watch the Purge, lol) or getting other luxuries. I'd be investing every penny into building Fort Knox or making my house completely impenetrable. Anything left over goes to buying the biggest and baddest fire power there is. When my house is a fortress and I have an arsenal then I start treating myself again.
As soon as my family is locked in on Purge night, I change the security code where I am the ONLY one that knows it. Not going to have that crap where my wife or kids can open the security doors and have me killed. Have whole family go through metal detector before getting into safe room. Kids these days might want to kill you or have you killed for taking their phone away, lol.
If my wife doesn't trust me or like my rules she can take a chance somewhere else.