You cannot extend family visit visa for more than 6 months. You have to exit and come back with a new visa. The gap of 3 months is been nullified you can come back as soon as you secure a new visit visa. Sponsors mother and father, brother and sister max 6 months and Sponsors mother in law and father in law, brother in law and sister in law only 3 months max. To extend your visit visa from 1 month initial to few months ahead you have to take the visa copy and passport to the Medical Commission in Abu Hamour, do the medical test check the result if your are fit. Go to the immigration also in evening with just the passport and ask for extension per month 200 Qrs. and when you extend your family visit visa to more than one month you have to take exit permit for that person when he or she is leaving.