The grandad is the dad of the dad, 1 son, then the dad has a son too.

He had been fishing, hence the boxes, rod and tackle, and when bragging to his friend on the phone he had said it was this big and smashed his hands into the sides of the box

He banged his head on the wall until it was sore. He used the saw to cut the table in half. He put the two halves together to make a whole. He jumped through the hole and shouted until his voice was hoarse and he rode away on the horse!!!

second!

His dad was completely bald!

an umberella!

a rainbow!

His horse was called friday!

It was a hologram!

He cannot reach the required button, floor 5 is the highest he can reach at the moment.