A childhood belief about family

I believed my grandmother would protect me from anything. On her 90th birthday we talked about an incident when I was 8 and was screwing with matches and gasoline and almost burned down the back fence. "You could have caught the house on fire and grandpa had to put it out. I had to tell your mother finally you were basically a good kid, but sometimes did stupid things and not to be mad at you." "Grandma, how long ago did you tell her?" "Last year." I was 40...