I can offer some general possibilities based on common reasons people may engage in such behavior:
Emotional issues: Your ex-husband might be struggling with emotions related to the separation or divorce. He might feel hurt, angry, or rejected, leading him to act out or seek attention from your family members as a way to cope with his feelings.
Desire for reconciliation: If he still has feelings for you or regrets the breakup, he might believe that getting closer to your family could give him a chance to reconnect with you or influence your decision to get back together.
Maintaining connections: During the course of a marriage, individuals often develop relationships with their partner's family members. After a divorce, some people may try to maintain those connections or friendships out of habit or a sense of attachment.
Control and power dynamics: Pestering your family could be a way for your ex-husband to exert control over you or to maintain some form of power in the relationship, even after the divorce.
Jealousy or insecurity: Your ex-husband might feel jealous or insecure about your life after the divorce, and his behavior might be an attempt to monitor or interfere with your current relationships.
Children's involvement: If you have children together, he might be using interactions with your family as a way to keep tabs on the kids or to influence their perception of him.
Lack of boundaries: Some individuals struggle to establish and respect appropriate boundaries after a breakup. He might not fully understand or acknowledge that he should give you and your family space to move on with your lives.
It's essential to remember that these are just potential reasons and may not necessarily apply to your specific situation. If his actions are causing distress or discomfort to you or your family, it's important to address the issue and establish boundaries. If the situation escalates or becomes problematic, you may want to consider seeking legal advice or involving authorities to ensure everyone's safety and well-being.