Deciding that Tim would try to overpower you in your new weaker form you take the socks and run off. You run down the stairs hearing Tim not so far behind. When you get downstairs you scan for a pair of shoes and see a pair of your own shoes. But there's also your fathers shoes as well.
Would you rather become yourself of your Dad? You decide that it might be better if you become yourself since the situation was strange enough. You grab the shoes and run into your parents bathroom. You put on the socks and shoes and feel the changes. But you hear Tim outside pounding the door.
Knowing he could unlock the door using a pin you use the window to escape and climb on the roof. Seeing your room close you began walking toward it when you remember the socks. You see that you have become yourself again. Then you remember your naked! Hopefully nobody you know will see you.
You eventually make it to your room and put on some clothes quickly. You then walk to your Parents room and see Tim fundling with the lock. "Hey Tim, have you seen a little kid?" You ask him. "But..." Tim says realizing that you were not Jason. It seemed that you have successfully tricked him.
Now the last part of the plan. You unlock the door using the pin and only walk inside by yourself before closing the door. "Oh, no!!!" You exclaim "Jason's Gone". Tim follows into the bathroom. "You're in trouble" He says before laughing. But you don't care knowing that there is no Jason although you learned that when using the socks you have to be more careful.