Got the labor department and collect Family visa application form and attach following documents.

1. Your passport copy with valid RP
2. Your wife's and daughter passport copy
3. Your Marriage certificate, educational certificate & daughter's birth certificate should be attested by your county emabssy and ministry of foreign affairs qatar.

4. Employment contract with minimum salary QR.7000/-
5. House Rent agreemant + Elecricity bill copy
6. Bank Statement containing your latest salary tranfer proof.

7. NOC from your company letter head should be signed by sponcer.

Go to labor dept. at 7.30 am and take token for submit application. after submitting application you will get a receipt. keep receipt for futher follow ups. you can check the website :www.mlsa.gov.qa after three days of submission.

Normally it will reject in first time but you can take apointment to meet the officers to explain and request your problem.

Good Luck for your mission