You were at the beach. You were with him, your mom, and your dad. You were playing in the ocean, not aware of what was to come. While playing, you dropped your toy underwater, so you went to get it

A few seconds later, your brother realized you apsense and looked around. He realized a hand reaching out in the water and immediately ran into the ocean.

Your parents didn't notice this due to them taking pictures for Facebook. He hated that they didn't notice their own child drowning. He dived right into the water and started to swim

"Hold on! I've got you!"