Thanks for the tips everyone. In the case of the family gathering I'm just taking snapshots to help document the event. I do a few posed portraits now and then but usually I don't have the luxury of telling say my 90yr old grandmother to move her chair so I can get better lighting on her. Its more of a "make due with what you got". Were I doing a planned purpose shoot I would definitely look into some type of diffuser/reflector setup.
Also to those who say don't shoot, that applies to planned shoots. Were I to wait until ideal lighting conditions, the party would be over and I would miss every photo opportunity. Usually I'm one of the few people with a camera at the "event" and the family is starting to "expect" that the "photographer" will take pictures for later. They like the pictures and poo poo when I cringe at a photo because it's only a so-so shot.