We only have 3 members, but are expecting number 4:

Per month:
Rent - $1000
Nappies (daycare wont use cloth) - ??
Petrol - ?? (only one car and it is DH's - so he know all that stuff. I don't drive)
Phone/Net package - $80ish by memory
Phone calls - $2.50 this month, 50c last month (ha, losers)
Daycare - $280 a week, so, 1120 for a 4 week month
Food - Recently went up...about $75 a week for fresh produce and $6 a week for bread flour = $324
Electricity - way too high, but this is a rental and EVERYTHING (water, power, cooking etc) is Electric = $215 for 60 days = $107.50
Water - not sure, but pretty good. Can't find a bill atm.
Mobile Phone = $30 a month

So that's minus the all car costs, pet food and water as I am not sure about them. Internet is high coz DH needs the high speed and high dl limit when he's working from home.