Inherited Magic

When Omar and his entire family are invited to a funeral, things start going wrong. As the relative was quite old, no one was surprised at his passing. At the crypt side service, Omar starts to notice strange people. They don't fit his family and stand to one side. They are watching the people attending the service, and are surprised when he is caught looking at them. When he files past the crypt, Omar notices the death date is from several years earlier, but no one seems to notice. Since the old codger was known to be a practical joker, Omar doesn't say anything. He assumes it is why no one else does either.
When the will is read out, Omar is one of two people directly mentioned. The problem is, he is the only one to get no money at all. At first Omar's younger brother asks why. Soon everyone other then Omar forgets all about it. Omar has to repeatedly remind people he didn't get any money. Soon he gives this up and just tries to ignore it. He assumes someone has talked everyone into an odd prank
Once back home and in school, Omar hopes everything will go back to normal. Then a strange chest shows up in his room. Everyone tells him he has owned it for years. He is sure he hasn't. As it is covered in strange metal vines and animals, Omar is quite sure he would remember it even if it wasn't taking up most of the free space. Then he notices the metalwork moves and changes whenever he isn't looking at it. He can't get others to believe him. No matter what he does no one will believe him. Then one day while looking the chest over, Omar realizes something. The chest is too large. It couldn't have come into his room through the window or door. Finely Omar decides this is just another part of the enormously strange prank.
Omar is sure of this until a wheelchair bound girl shows up with a letter from his dead relative. This letter says the reason for everything happening is magic. Omar thinks this is just more of the joke or prank, until she proves him wrong.
As Omar is trying to understand such things as talking cats, the girl informs him he needs to make a will. He doesn't even have time to remember the warning about magic being dangerous, before the door to the kitchen is blown off. When the dust clears, Omar finds a man standing in the doorway. He challenges Omar to a magical duel!
One event after another keeps Omar hopping. If he doesn't learn the magical laws quickly, he may not live long enough to ever find out.