The way I understood it to be was that if you pull into your two car garage, shut engine off and exit the vehicle the washer & dryer are inside of the garage with you and your vehicles. In the far right corner as an example, side by side. The garage door opens & shuts the driveway and street off. In my experience you then have an exterior door that you open to enter the house. Typically into the kitchen area but with a locking mechanism on inside of the house side of that door. I've heard of my neighbors forgetting to close the overhead garage door at night and have stolen items missing from their garage because they've forgot to push the automatic door down. The baby Sabrina Eisner (spelling?) missing case IIRC was thought to have been accessed via the door leading into the house from the attached garage after the automatic door left open.
Anyway, if the garage door wasn't used by the father, say he parked on the street or in the driveway but didn't pull up into the garage, he wouldn't have seen anything amiss going on. He said he had his keys and when he went to put his key in the front door it was not locked didn't he? IDK. Just trying to help with a description of Texas garage laundry room/hookups.
IMO when a horrible accident or self inflicted injury happens there are no details reported to the public. When LE never provides updated information with COD, MOD after the media reports an incident, that generally tells us that what happened is none of our business and if the family wants you to know then they can give you details. I'm not saying that is what happened but I strongly feel like the investigation is not leading LE to believe that the child was a victim of violence.