Dreams, especially nightmares, can be quite intense and often reflect our subconscious thoughts, fears, and experiences. In your dream, the mountain climbing expedition could symbolize a challenging journey or a significant undertaking in your life. The fact that you were the leader might suggest feelings of responsibility or pressure to guide your family through difficult times.

The melting ice and thinner air could represent feelings of instability or vulnerability in your life, possibly indicating that you are facing challenges that seem overwhelming or that are becoming increasingly difficult. Your father's slip and fall, especially since it echoes a real-life memory, may indicate a fear of losing stability or control, not just in a physical sense but also emotionally or relationally within your family dynamics.

The involvement of your deceased uncle might suggest a connection to unresolved feelings about loss or family ties. The fact that your aunt and uncles also attempted to help could reflect your desire for support from your family during tough times, and the ultimate isolation of just you and your mom at the end could illustrate feelings of helplessness or a need for a stronger bond with her.

Nightmares often serve as a way for our minds to process stress or anxiety. It might be beneficial for you to reflect on any current pressures or fears you have regarding your family relationships or personal challenges. Consider discussing these feelings with someone you trust or exploring ways to address any underlying concerns in your life. Writing about your experiences or engaging in relaxation techniques before bed may also help alleviate future nightmares.