don't give a NOC unless you are sure that he will be joining a good company. plan ahead because you will feel a lot of pressure later on especially when you're planning to raise your family here. the rule is that the father will always be the sponsor of his children, and when he goes, everyone under his sponsorship will have to go with him.

if he is presently unsuccessful in his job hunting and the offers that he have received were not the best, then let him leave qatar and just come back again later.