Painting Stars

Elio is a 16 Years old boy. He lives with his mum and dad.
Elio's dad says al of a sudden that he wants to move houses. He looks panicked. When they pack their stuf, Elio sees a lot of paintings packet. He asks his dad why they have so much paintings. His dad looks shocked. He tells him that painting is just a hobby of him.
Then one day, Elio wakes up in the night by a sound in his new house. He looks through a crack from his door to the hall, where he sees his dad walking down the stairs. He hears the door. Then he looks out of his window and sees him looking, without any color in his eyes, to the stars.
When his father comes back he takes the keys and puts 1 key in a hole in the ceiling. then a hatch opens with a ladder. wow, I didn't know we had an zolder, Elio thought.
Then one day when his parents go out, he manages to pick the keys. He goes to the zolder and when he gets there...he sees al paintings of people and other things. There is also a big painting where two boy's are painted on and one of them looks like himsel...what does this mean.