Hi kshettigar, Mr JD,
Immigration rules keep changing on an ever regular basis here in the Sultanate.
That is why it is best for you to check with your prospective employers as to what the latest rules and regulations are.
Since only the employer's PRO has access to the government authorities, only he would know the exact and the latest update on these issues.
I can tell you what the rules were sometime back. But I may not know what exactly is the latest on the same. That is why it is best to check with your respective employers.
Ultimately, it is your sponsor / employer who is entirely responsible for everything official about you and your families.