Show interest in in-laws hobbies
Look for an activity that you can do with your in-laws, such as gardening or jogging, and give it your all. Who can say? You could join up for a 5K together. Congratulations, if you learn something entirely new, enjoy it, and can thank your in-laws for it.
According to University of Pittsburgh research, the "exposure effect," or being around someone, significantly impacts social relationships. Instead of avoiding your partner's parents, actively arrange plans with them.