I fight authority, Authority always wins

Now that Blaise is walking he is destroying any semblance of normalcy for poor Finn. Everything that Finn touches, plays with, or holds sacred is now under attack of fat baby walking. Blaise is into total domination of all items Finn deems off limits. I am trying to instill the doctrine of sharing today. It is all going to hell rather quickly. Finn has requested a train table to be built that is on stilts. When do siblings play together and the world doesn't split apart? I need a cage. I am sure there is a tutorial someplace for this.