Mike.. all my kids are vidiots of some sort or another.  Oldest is the typical teen and generally surly and hiding in his room.. 7 and 4 yr olds are usually harassing and beating the crap out of each other.. that right there doesn't need ME to supervise.. they have it down to a science..  2yr old is ultra smart and usually tooling around the house seeing what mischief he can get into.. and the baby is just a hood ornament right now.. not much is needed with her other than the occasional lap time and wife takes care of the feeding issue w/her.  Other than that.. they're getting filthy outside, playing vid games, surfing netflix.  All stuff that only needs the "make sure they're not killing each other or the neighbors" glance once in a while.  That and I just need to set a render baking and walk away.  For me it usually takes 8 to 24 hrs for one to be finished and the computer is too slogged out to do anything else; so, I go off and beat the kids or try to leave them at a park or something.