It can be pretty tempting to end all relationships with your in-laws, but this decision can make your partner torn between you and their parents. Before taking such a drastic decision, try to find the root cause of the problem and communicate it calmly to your partner. Try to find common ground with your in-laws and see if all of you can reach some sort of compromise. If there're any sensitive issues, let your partner know so you can present a united front. If nothing is working, suggest family therapy for your partner's sake.