Dreams involving ex-partners and family can often reflect your current emotional state and unresolved feelings. In your dream, the presence of your ex-husband and the intimacy you shared, despite your apprehension, may symbolize a longing for connection or a desire to revisit past emotions. The interruptions by your child could indicate that you are navigating the complexities of co-parenting and the need to balance personal desires with parental responsibilities.

The appearance of your deceased grandmother suggests a longing for guidance or comfort from family, especially during challenging times. Your actions, like trying to wash the utensils for her, may symbolize a desire to nurture or connect with family traditions and values.

The situation with your ex-husband's comments about having a girlfriend might represent feelings of betrayal or insecurity. It indicates that you might be grappling with feelings of rejection or the fear of being replaced.

Overall, this dream may be urging you to explore your feelings about your past relationship, your family dynamics, and how you navigate your identity as both an individual and a parent. It might be beneficial to take time to reflect on these emotions and consider what you truly want moving forward. Talking to someone you trust about your feelings could also offer clarity and support.