They look a bit off to me... Especially Pa Gorg. They may indeed be authentic, but something seems wrong about them. Pa's coloring and overall design is way off. Ma is close, but I believe that there was only one PVC figure casting of the Gorgs (from a German company) and I think she was holding a hanky in her hand rather than a bag. Her colors also seem different than I recall. Junior looks close, but still not quite right. I think his shirt had a straight edge on the bottom, rather than the tapered look.
They could be some off-brand, but I don't believe they are the officially licensed ones which were originally made in the 80s.