So no super recent experience but the family
part will still be relevant . Back in 08 my wife and kids
who had entered FP on French EU passports and myself whom had entered on a US passport found we needed to stay a few additional weeks. So my wife thinks since she and the kids
are French it should be easy to persuade them to let me stay a little longer. Not so, no consideration at all. Well after that experience I obtained my British EU passport and the next trip through was easy. Of course I am in the same boat
now facing loosing my EU status.