Your father has a condition that took part of his movements, he's independent for almost everything, but still needs some help, Seth tries to do things alone because he thinks he's a burden to you. 

Seth tried to grab something off a shelf but lost his balance and fell out of his wheelchair, the cold air of the lonely house was even more present while he was on the floor unable to move.

After a few hours, you arrived from school, you ran to him desperately as soon as you saw him on the floor.