If the basic expenses will be free like house, bills, mobile, transportation and school, and take note schools are expensive here. It's good but try to negotiate more.

Family dine out-min 500
Petrol-500 a month
Groceries weekly-max 1,500

And also it defend in your social life.

Try to read this Sample Budget and Cost of Living
http://www.qatarliving.com/node/15384601