There was an episode on Netflix about true crimes that is similar to this. A guy’s business collapse and he couldn’t provide for his family anymore. Decided to kill them, buried them under this dugout in the yard. Told neighbors, extended family, and friends that he was going somewhere for work for a while. Neighbors noticed their window doors were shut for a week or so (usually always open). They called the cops, they showed up, didn’t find anything. Nobody saw the family around for a few weeks so cops kept coming back and finally found the bodies. Then manhunt was out for him. Dude was smart though and used similar tactics to throw them off his trail. Last anyone caught a glimpse of him was on some cameras at a motel where he stayed. Cops showed up days after he stayed and he since then disappeared into the woods with a rifle. Never seen since and it’s been years. Eerily similar.
Edit: here it is -
https://www.netflix.com/us/title/810...&clip=81175940
It’s the house of terror episode.