This is absolutely a matter of grade of the company. A clerical staff of a profiled company will get QR5000, while the manager of a low profile company may get less than that!
Its something you should negotiate with the management considering your qualifications, experience and the status of the company.
In fact it is not possible to lead a decent life here with two children family even with QR.10000, as the rent here is very high, almost similar to Dubai or Abudhabi!

Good luck , try for better!