New 2 BR house/apartment would cost around QR 7,000 to QR 9000 i think these are f/furnished or semi-furnished. for the groceries, depending on you, but on average you'll spend QR 500 to QR 600 per week. plus your utilities water & electricity and the tuition fee of your kids. i would say for QR 15,000 package you wont save a thing.

there was a study before that for a family with 2 kids the minimum package should be around QR 19000 to 20000. hope this helps. goodluck ;)