Go to the main immigration building at madinat khalifa and bring the ff.
1. NOC from your company and contract.
2. copy of valid QID
3. copy of your marriage cert.
4. copy of birth certs of each family members
5. passport copy of each.
6. ATM card (QR 200 each for 1 month stay)
they can stay for 6 months but needs medical examination at NHA before approval of extension(another 5 months).