I have always used my 911s as family cars. Even the old air-cooled ones with vastly less space (in context). Wife, two kids, two dogs and luggage for the weekend for 3 hour drives to the lake house. One benefit is that no one minds if you go faster and make try to make it a two hour drive :-). Made a quick drive to Atlanta and back this weekend. Below is a GT3 parked at PORSCHE of North America, Atlanta. (Static Display, lol)
PS - my wife fits fine in the backseat - size 00. Jeremy Clarkson pointed out in his review of the 997 Turbo a long time ago you get the super model wife to go with it.