Peculiar post here!??! But as someone who lost my Dad when I was in Elementary school, and my Mom passed away when I was in High School, :my2c worth is, don't sweat the small stuff, just be glad you still have a Dad. As the rest said, if you need more room, build another shed, I'm sure you're Dad appreciates you letting him use the space, and after all he, and your mother, did bring you into this world, it can't hurt to show some appreciation in return.
Cheers,
JD Dozerman