You can't be partial to her food. If you still want to eat, don't compare with others ... when you eat, go and cook something delicious for the old man and show you. The old people will naturally understand ... just give the sister-in-law's share to the old people, and say, I don't know if you are short here, just give it to the old people ... and then sit there and watch the old people eat. If they say sit down and eat together, you will say that you have already eaten the demonstration ... you can't eat anything that suits your taste ... you can eat it. Just turn on the TV or something, and the old people have finished eating. You are walking.