You must have held your AP for at least a month before you can sponsor anyone, so you would have to get your passport in advance. In order to get the discount you must all go to the Annual Passport office together. There is no way around this rule.If your girlfriend and sisters meet the criteria, they will get a 10% discount and you will get 12 extra months on your AP. If you log on to this site www.dlpguide.com and then click on planning and then Annual passports you will find lot's more information to help you.