Qatar does not issue "Permanent" visas to anyone as far as I know.

However, for long-term family "visit" visa, you will need:

1. Form signed by you and your sponsor
2. Bank Statement (6 months)
3. Electicity Bill
4. House Rent Contract
5. Marriage/Birth Certificates as applicable, all attested by Qatar Foreign Ministry.

There are also salary and profession restrictions that apply.

Once your family is here, they will need to go through medical tests and finger prints.