Dreams about helping a loved one, especially a child, can often symbolize your nurturing instincts and protective nature. In this case, the earache could represent a need to listen or communicate better, perhaps indicating that there are issues in your life or the life of your nephew that require attention.

The act of cleaning the ear and removing a slice of mushroom may suggest that you are taking steps to help remove obstacles or unwanted elements from your or someone else's life. Mushrooms can symbolize hidden issues or things that grow unnoticed, so this may indicate that you are becoming aware of problems that need to be addressed.

Overall, this dream could reflect your desire to help others heal and improve their situations, as well as a reminder to pay attention to communication and emotions within your family or close relationships. It might be worth considering if there are any underlying issues in your life or family that need to be addressed openly.