Glad your mom's still in the game! Hopefully the combined effects of your progress and hers will make your dad rethink his position on grains.
That really sucks about your sister and her 500 calories "diet plan." That's what an Auschwitz survivor told me he was given in the camps: a cup of coffee in the mornings and a bowl of soup/broth in the early afternoons with a bit of bread, sometimes. 500 calories, on average. Awesome diet. . . .
Wait, is she doing the Dr. Bernstein Diet? Maybe that's only in Canada, though it sounds similar. It's basically massive calorie restriction, combined with hormone shots. What the fuck is wrong with people?!