Someone stole Daughter's guns. That was ill-advised. Is someone trying to steal Son's stuff too? Daughter is convinced to join ZOMFU, and ZOMFU asks Son to investigate some thefts. A lot of things get hacked or broken, and someone gets hit in the head with a toaster
Son and Daughter continue to investigate thefts. There are new Bad Guys. Daughter continues her ZOMFU training. There are guns that shouldn't exist. A lot of stuff gets burned, bad guys get beat up, and someone just barely manages to get hit in the head with a toaster.
Daughter can't get a knife because she has knife, but learns a valuable lesson about ethics and then steals something. Son uses computers to learn that someone is bad at computers. A few people get their comeuppance and one of them get hit in the head with a toaster. Someone notices Son and Daughter.