My mother told me early on that I do not get to choose my family. I get to choose my friends. Which makes friends enormously precious, when your family can be such a horrific embarrassment and let down. She also said it is perfectly OK to hold negative views of one's family members. What isn't OK is to let their negative qualities have anything to do with YOU. You are your own person and nobody in your family makes you any less.
She said that learning how to handle oneself when in the same space as disgusting family members (racists, 'phobes, willfully ignorant, etc) is good practice for how to conduct yourself at work, where you don't get to choose your co-workers, either.
It might be helpful to talk about the options she has for how to conduct herself.
Silence is one, but if it implies consent that's another issue.
"Excuse me, I'm going to the lady's room"
"I'd prefer not to discuss this"
"How about those Giants?"
"You racist pig!" is another option, but rather nuclear. Consequences of going this route can be rather unpleasant.
DD16 is grown up enough to start coming up with some strategies in dealing with her new "family"
I called my uncle "Carbuncle" once he'd left the house.... it helped me manage my anger.
FBW then 46, XWHNPDPAFTG the destroyer of my entire life. D-Day 1 '99, D-Day 2,3,4,5,6... '09-'11, D '15. I fell apart. I put myself back together. Forgiveness isn't required. I'm happy and healthy now, and MY new life is good.