My brother got married in the eighth grade, my father had to go grocery shopping (just tomorrow) on the fourth day of junior high school, and he had to put it at home for a few days after buying vegetables. At first the cook said he made a list and asked my dad to buy it, now

My brother got married in the eighth grade, my father had to go grocery shopping (just tomorrow) on the fourth day of junior high school, and he had to put it at home for a few days after buying vegetables. At first, the cook said that he had made a list and asked my father to buy it, but now he has changed his mind, saying that tomorrow they will go to buy it together. My mom is complaining to me here, and he can't be my dad's lord, what can I do?