The man's mother believes in fortune telling, how can we convince him?

I don't think you should choose to escape. Accordingly, you two should unite. Since expectant mothers are superstitious, you should try to change this view. It seems that you two don't have such persuasion ability. Then start with the people around the expectant mother and think about whether there are people who can have prestige among the expectant mother and have a slightly modern mind. Do a good job in the ideological work of expectant mothers. Yours is the main force that plays a major role at this time, and you are the backing. At ordinary times, you also take the initiative to cater to her affairs, buy things she likes from time to time, and your lover will put in a good word in front of her in time. All this should be done slowly. In short, both reason and action should be taken. It should be improved in the long run. Once again, you two must unite, which is fundamental. I hope these can help you!