I spent the majority of the time watching this show analysing how it got to air...
The conclusion I invariably came to was that the big guy (Sam) actually paid for the show to launch the careers of his daughters seeing that he'd been a stuntman in Hollywood for decades.
There were a few things that led me to that conclusion:
1. The format of the show isn't really 'connected'. Or rather, the only connection between parts of the show - stunts, race prep and racing - is that big guy has a daughter (or two) in each part.
2. In the stunt parts, the two daughters who apparently do that work in real life, are filmed standing still most of the time preening themselves doing little hair flicks in front of the camera. Also the stunt work they're doing doesn't really look like stunts to be honest. Big man seems to have that covered to be honest.
3. The eldest daughter and her love for cars and racing is obvious and she seems very talented. The family members she's got supporting her however look like they've been roped into it and are in real life completely inexperienced. This is evidenced by the fact that one of them is asked to get 'balanced' parts delivered and completely fails to do so even though that's a basic task within the race parts industry. In fact, it's not just weight but also after an engine has heated up that much, blueprinting is also another method I would have thought was used to check for heat warping but it wasn't mentioned. So that didn't quite make sense to me.
It's trying really hard to be something but ultimately falls short. Not for a lack of effort mind you. More like they just rolled the dice with this show and didn't quite make it.