My wife and I have been building a playhouse for our kids on the backyard. Our neighbor keeps telling my wife that we must put up a fence and/or get lots of insurance because if her son gets hurt in our playhouse, we're liable.
My question: if we don't invite her son into our yard/playhouse, and he finds his way there, and gets hurt, are we actually liable for that?
My intuition is that we're not. Example: if I jump into my neighbor's yard uninvitedly, and her dog bites me, they are not liable for this incident. However, if their dog breaks into my house and bites me, then they are responsible for it.