Crime documentary about siblings accusing their dad of homicide? : TrueCrime

Unsure if that is the place to submit this however I’ve been trying to find this for years.

Once I was younger, possibly 15 or 20 years in the past, I watched a documentary about two siblings who claimed their dad was an uncaught serial killer. The documentary was made by a British workforce (I believe), however the topics have been both from the USA or Canada.

All I keep in mind was that the siblings have been middle-aged and white, and claimed they’d truly witnessed their dad killing individuals, together with troopers and hitchhikers he’d picked up.

The documentary additionally interviewed the dad himself, who appeared like a standard, aged man who was bemused by the accusations. I believe the insinuation was that possibly the siblings have been a bit bizarre and had made all of it up.

Any concept concerning the documentary or the case it may need been overlaying is tremendously appreciated.