This kind of old man can be seen everywhere. There are two situations in which he is unreasonable and troublesome: one is that he is unhappy and some things do not go according to the old man's will, causing the old man to make trouble. Second, the old man himself is an ungrateful and unreasonable person. He has no reason to explain in front of the old man and no one can be persuaded by reason.
One of these two situations is easy to solve, but there is really no good way to solve the second situation.