Almost Killed Grandma

I was seven or eight years old when my family convinced me that I had almost killed my grandma. We were all in the pool at my grandparents' house. My grandma was letting my step-sister stand on her bent knee so she could jump up and make a splash in the water. It looked like a lot of fun, so I swam over to join them. When I tried to get on her knee, my grandma pushed me away. She started yelling at me to get off of her. Then everyone was yelling at me, telling me I shouldn't horse around in the pool. They pulled her out of the water. The adults all looked very upset and I didn't understand why. Suddenly, paramedics were in the house. I tried to ask my parents what was wrong, but again they just yelled at me. They said I almost killed grandma and that I had to go to my room.