not remembering past getting out of the car.

We were coming home from swimming  My dad saw it first turned into a driveway and stopped. We got out of the car it was a clear day not a cloud in the sky. The ship was huge about 1000 ft long about 350 high about 3000 ft. off the ground .  It was the color of a gray cloud didn't make a sound  I don't remember anything after that.  And it was a long time before I remembered that much.  I was 15 at the time.  My father mother and sister remember but one brother does not remember it.