What is my core living expense

Just did a calculation how much the core living expense is for the family

Its around $2000 CDN per month.
If I include other expense like kids expense, mortgage etc, the total is about $3500.

The core living expense covers property tax, utilities, grocery, internet, cell phone plans, gas, public transit.

$2000/month passive income is certainly easy to achieve. Even $3500 passive income is reachable if I do some re-arrangement.