I would put in an 'individual' change of address. There is a box on the change of address card to be checked,for business, family, or individual. A change would have to be filled out for every person in your family, each one checked 'individual'. The person is right about everyone at good sam with a last name the same as yours would have their mail forwarded if you checked family. But by checking individual, only the person with the name specified on the form would have it forwarded. The mail would be pulled out and forwarded before it was received at good sam-they probably would never see it. When you have everyone notified of your new address then cancel the change. As an ex postal employee I would give it a try.(unless the regulations have changed since I retired.) Gary