What does it mean if I dreamed that polar bears attacked my younger brother?

[Binny]

I've had this dream before but in a different setting. I with my family and were out just doing the family thing and there's these polar bears in a pool playing around. Now were walking around and these bears have no barrier around the pool so they could get out any time and someone could get in the pool at any time. I walk away to go up the stairs next to the pool and all of a sudden my younger brother is in the pool being attacked by this young bear. My dad jumps in and tries to help but fails, my brother gets away but right before he reaches the edge of the pool the bear latches on again to his legs. It's as if I blink for a split second and my brother is laying on the side of the pool with my mom dressing his wounds and he is just laying there, limp, and bleeding. I feel as if it's my fault this happened, I should have been watching more closely and should have been able to get him out of the pool. Everyone is just staring at me. What does this mean?