My mother does not believe in food issues, except deadly allergies. My sister and I are both made sub-lethally ill by fish. My mother has, on several occasions, lied about what was in something only to have my sister rush away from the table upon attempting to eat it. My mother insists that my sister is making it up. Should I keep trying to explain to my mother or encourage my sister to adopt my don’t-take-food-from-Mom strategy, which my mother insists is rude?