if you want to bring your family for one month, it is very simple.
Download the tourist visa application form from the moi website and print after typing in the details.
Attach copies of passports of your family members, your RP and visa.
If you have a proof for your salary, (company salary certificate or bank statement) take it along with you.
Go to the tourist visa (and exit permit) application office near the airport (on the right hand side)
The mudheer there will approve your application if the surname of yours and your family members are same in your passports.
Fees per application is only 100 RIYALS. This visa is ok for one month stay. I dont know if this is extendable after 1 month.