[bobthecop]

Build your shop, and set the rules, but do not exclude any family members, especially your wife. When it is new everyone will want to share in the new space, but as time goes on they probably won't care much about your space especially if there are clean up after yourself rules involved. Lock your tools and get the kids some tools of their own. If they abuse their own, then the possibility of using yours goes down the tubes unless you are present. The space will eventually be all yours, it may just take some time.