I worked in Community Mental Health in Sydney for 5 years. During that time a number of people were killed whilst experiencing psychotic episodes, thankfully none of my own clients. Colleagues had to brief police on how to respond, they were dumbfounded at the ignorance and blatant disregard.

I would never call Police if a family member was going through a similar psychological event. Do whatever you can to handle it yourself before introducing jumpy idiots with firearms to the situation.