Sorry. I don't see it. I don't see how the MC is "spineless". One way or another, he loses the thumb-drive. That pissed off the dad, who took it out on him for fucking up. He took it because, 1} that is his father. 2} that is his boss (in a sense). What do you expect him to do, tell his dad off? The dad appears to be unhinged a bit.
With the girls, I don't see him as spineless either. He helps the mom and younger sister out not only because it's the nice thing to do, but because he figures it will help put a good light on him with the hard-ass dad. And he has to work with the older sister anyway, so he helps her out as payback for helping him look into the tattoo business.
But that's just my opinion on the matter. Maybe in a few updates, we will see if he is as gutless as y'all claim. But for right now, I don't see it.