It is often helpful to view your child's relationship with their grandparents as independent from your own. While your resentment is valid, allowing your child to benefit from the love of extended family can be a positive experience. To maintain your peace, keep clear and explicit boundaries regarding rules, feeding, and outings, and ideally have your partner communicate these boundaries to their parents to minimize conflict. Stay observant of the interactions to ensure your child’s emotional well-being is protected, and prioritize your own mental health by speaking to a trusted friend or therapist about your feelings.