Average yearly expenses

Car Insurance +/- CHF 1300
Health Insurance (depends on your ages and cover)
+/- 200 per adult and 50 for child per month 5400
House contents insurance 600 600
Phone line rental 25 month x 12 = 300
Calls CHF 20 month 240
Internet Broadband 45month x 12 = 540
Mobile depends on contract
TV licence 450 450
Cablecom 25 month x 12 300
Flat Rent +/- 1400 16800
Charges +/- 200 2400
Car leasing (would imagine about 400) 4800
Petrol 200 month 2400
Total 35,530 or CHF 3000 per month

Supermarket Bills depends on your lifestyle, anywhere from 200 to 500 per week I would imagine ,
Weekend entertainment, eating out once in a while etc is variable
(if you want to ski in the winter then add another chf 75/100 for a family day skiing plus equipment , it gets addictive so count that for most weekends!

I’m sure these figures will be corrected by other members but at least it’s a starting point for you .