So, judge the son for the sins of his father?
The Bible has a bunch to say on the subject. Leviticus says "Yeah, if the dad does something bad, then kill his kids for X generations." Chronicles says "No, dude, if someone does something, they're the only person accountable. You don't punish a kid for what his dad did." are the two basic opinions.
If his son was a 3 year old infant, would you advocate killing him to pay for his dad's actions? How about if he was 8 years old? Would you be the one to look into the kids eyes and cut his throat? 10?