Dear Brother..its a very easy to extend family visit visa .just you need to go medical commission for medical within a month.you give your debit card to your wife and she will pay inside 100 QAR.only passport copy or visa copy of ur wife is enough.when you will enter the medical commission take first right and go extreme and there is ladies section for medical .it will not take too much time in shaa Allah.then just check online your medical test result within 2 3 days u will get result and then go for visa extention..hope u satisfied with my answer..thanks..