How should the daughter-in-law treat her husband's parents who live with her in the same house, especially if the father is strict?

Parents hold a great status and deserve kindness, gentleness, and humility. A Muslim is rewarded for good character and humility towards believers. Whoever treats his wife's parents as his own parents is a doer of good and will be rewarded. This treatment is not obligatory, but the reward increases if it is done with the intention of pleasing the husband and maintaining a good marital relationship.