they required nothing. you just fill the form for renewal RP. put picture and attach it with passport. just ask in counter that you need extension for family visa, dont take no (because in zabit(officer)you have to make a line, when your number will come just give him the document, he will open lock in computer for your family and then he will return your passport and then you can go to main counter and take number. NOw you can go to any counter and make your Family RP DONE.