Dreams involving deceased loved ones can be particularly powerful and often reflect deep emotions and unresolved feelings. In your dream, your mother hosting various guests might symbolize a desire for connection or community, but your annoyance suggests a struggle with boundaries and personal space. This could indicate that you’re feeling overwhelmed by external influences or people in your life who may be overstepping their bounds.

The presence of unknown guests can represent new challenges or situations that you feel uncertain about. Your mother's response to the guest's intention to move in next door suggests that you are seeking guidance or support in navigating these new dynamics. It may reflect your wish for protection and the need for your loved ones to understand your feelings.

Overall, this dream might be urging you to establish clearer boundaries in your waking life, especially regarding relationships or situations that feel intrusive. Consider reflecting on areas where you may feel overwhelmed or where you need to assert your needs more clearly. It's also a reminder of the importance of support from loved ones as you navigate these feelings.