@85_Ranger4x4 I can't imagine what that family is going through... for your own family's sanity, I would get a battery powered door chime that has a sensor and it goes off when the door is opened. you can put that on the outside of the little guy's bedroom so he doesn't even get a chance to go outside before you hear it, and being nearby your bedroom you would be more likely to be woken up from it. they are less than 20 bucks, and well worth the added relief that they give you to know what your kiddo is doing. get the door knob slip collars that for a person with tiny hands will not be able to turn the knob, but grown ups can pinch in the right areas because their hands are bigger to open the door.
Kids are a lot more smarter than you can imagine, and until they get old enough to understand what they are doing can hurt them, they can really drive you as parents up a wall crazy trying to second guess what mischief they are going to get into.
As you know our youngest has Aspberger's (high functioning Autism) and due to "eloping" (running off when upset) being a common issue with kiddos on the Autism Spectrum, we found that the door knob slip collars were great on keeping them contained to the inside of the house or even a specific room. but our son quickly outgrew and figured out that principle, but it did get us to the point of teaching him the dangers of just running off outside before we stopped using them.
The biggest scare that we ever worried about was what if he ate something that he shouldn't and didnt' tell us? like got into the ibuprofen bottle that my wife leaves out and half the time without a damn lid on the bottle... and one scare where she had a bottle of benedryl without the cap on tight and he found the bottle and was playing with it... so in we walked and see that the cap is off and llttle pink pills alll over the floor... talk about scare teh crap out of you... quick trip to the ER and it was determined that he did not ingest any... must have just liked the rattle sound. (he was about a year and a half old.
AJ