Dreams involving doors often symbolize opportunities or new beginnings. In your dream, the knocking on the main door could represent an impending change or a new situation entering your life. Your husband's action of opening the door might suggest that he is the one who is welcoming this change, or perhaps he is more open to new experiences than you are at the moment.

The two covered objects you describe, especially their resemblance to chalices, could symbolize blessings or gifts being presented to you. Chalices often represent spirituality, abundance, or emotional fulfillment. The fact that they were covered might indicate that there are aspects of these blessings that are still hidden or not fully revealed to you.

The colors of the cloths—red and white, green and white—can also carry significance. Red is often associated with passion and energy, while green typically symbolizes growth and renewal. The patterns on the cloths might represent complexity or the idea that there are layers to the situation or opportunities being presented to you.

Your thought that the visitor could be your brother-in-law might indicate a connection to family dynamics or support systems in your life. The fact that the objects were taken to your son's bedroom could signify that these blessings or changes may have an impact on your family's future or your child's life.

Overall, this dream may be encouraging you to embrace new opportunities and trust in the blessings that are coming your way, even if they are still not fully visible to you. It might also be a reminder to consider how family relationships influence your perspective on these changes. Reflect on your feelings about the changes you're experiencing in your life, and consider discussing them with your husband or family members for support and clarity.