there is two kind of family visa..

1. family visit visa which is only need to get NOC from your company stating how much your salary (should be at least 5000QR), MOI form and applicant passport copy and if you have contract to your house, marriage contract or birth certificate (photo copy is fine and not necessary to be attested) will be a plus to get family visit visa.

2. Family permanent residence visa need to be 10,000QR salary 3 month bank statement, degree certificate, marriage and birth certificate, NOC from your company, contract for your house (only for wife and children, parent is another story-depend on the situation before they approved the residence visa for parent)