will state the figure in US$

accommodation (house rent): 5000 (monthly)
school per kid: 5000 to 10000 (annually)
car: 600 to 800 (monthly)
utilities: 300 to 500 (monthly)
dining: 5-10$ per person for fast food
15 to 25$ average restaurants
25 to 60$ prestiguous restaurant
coffee shops: at least 7$ per person
cinema: 10$ per person
sports clubs: 1500 to 2500 per person
grocery: 1000 to 2000 (monthly)
drinks inside bars are about 6 to 15$ per drink

did I miss anything?

guess now you can your calculaions

Regards and welcome to Qatar