you are on a visit visa right? so you can extend your family visit visa by doing the medical you need to go medical commission just to pay 100 riyals no examination done...My advise renew family visit visa 1st, so that you are not on a hurry to apply for RP, sometimes very difficult to comply the requirements...but if you have all the requirements you can apply asap it will take 3 days to release the RP you can check in MOI website...