Dreams about water often symbolize emotions, while heights can represent aspirations or feelings of being overwhelmed. In your dream, the 10-story jump suggests a significant challenge or decision in your life that feels intimidating. Your hesitation to jump may reflect a fear of taking risks or stepping out of your comfort zone, especially in a family or social context where there may be pressure to conform or participate.

The net shaped like a cone could symbolize safety nets that people have in place to catch them when they take risks. However, the fact that one of your cousins flies out of the net may indicate a concern about the unpredictability of such risks—what if things don't go as planned?

Declining the drink offered by a family friend may suggest your desire to maintain clarity and control in the situation. It could also reflect a reluctance to engage in certain social activities or pressures within your family dynamics.

Overall, this dream might be encouraging you to reflect on your current life choices and the risks you are contemplating. Consider what the jump symbolizes for you—is it a new opportunity, a relationship, or something else? It may also be worth exploring how you feel about the expectations from your family or social circle and what steps you're willing to take to pursue your own path.