especially when your 2 brothers are only 11 & 22 months older. Grandfather lived next door and my oldest brother was this young girl in your story, but the same experiences never happened to the other two of us. Grandpa always said that we would get such adventures when we were as old as the oldest--the anointed one. Didn't ever happen.
So, as long as such adventures really happen for the other sibs, then this is great. Often they don't and that sucks if you're one of the other sibs.