My child and I were sick at the same time, my mother-in-law was on a business trip, and my husband asked me to cook for my father-in-law. What if he shouts for food after work?

Then tell your husband your actual situation! If he doesn't believe me, you can go to the hospital yourself, or you can call your father-in-law directly and tell him that you are ill and you may not be able to cook for him today, so that your husband won't be unreasonable and your father-in-law won't be unreasonable!