If you have a wife, you must show them a marriage contract
If your working here in qatar, you must show them your salary statement from your company. the minimum salary must be 5000 - 6000 Qatari Riyals,(this can help that expatriates will approved your family visa if you have that big amount salary. coz its a way you can provide your family food and house to stay) and if you dont have that. im so sorry.
For childrens, show them the Birth Certificate. A proof that this childrens are yours.
Apply this form with the help of arabic people. coz this form is arabic. http://www.moi.gov.qa/site/arabic/departments/PassportDept/resources/200...
if the form wont work just visit there site.
http://www.moi.gov.qa/site/english/forms/index.html
Requirements of Family Visa,
If you have a wife, you must show them a marriage contract
If your working here in qatar, you must show them your salary statement from your company. the minimum salary must be 5000 - 6000 Qatari Riyals,(this can help that expatriates will approved your family visa if you have that big amount salary. coz its a way you can provide your family food and house to stay) and if you dont have that. im so sorry.
For childrens, show them the Birth Certificate. A proof that this childrens are yours.
Goodluck...