what is the problem with the father ?? spoiler

Well. Personally for me it was because the father knew his son was dead. Then he turns up having been made into a cyber-futuristic killing machine. How would you treat them? If they were alive it would be hard to let go of all the grief and be happy to see them. As it was it would be like loosing your son only to get a call 2 years later that he hadn't died. But that he was now dead.

Yeah, I was surprised to see the alternate ending as well. In that version, Scott kills Luc's mom, then they fight, and Luc kills Scott. Then Luc's dad shows up, whips out a gun and shoots Luc. Jerry Orbach shows up and says "they weren't your real parents, they were working for me all along, it was a trap I set for you." Then the police show up and cart Orbach and fake dad off to jail. Then they reveal that Luc goes off with Veronica, lives a happy couple of months, and dies of complications from the experiment. Kind of a downer ending. They changed it so the parents live and are actually his real parents now, and added the scene where they're cowering in the barn during the fight. I guess Dad's emotionless performance that remains in the film shows that he was originally intended to be the final villain.