Let's clear this confusion up.

You could not be more wrong

You could try

But you would not be successful

But how did he know the name of their son?

Absolutely untrue. They captured and tortured the tax evader. Bill Mosely, the actor who plays the murderer is CLEARLY not the one who hangs himself. The actors look similar but I am a Bill Mosely fan. He was not the one they tortured, regardless of any bandana.

@fraumachina I'm sure the tax evader heard the child's name during the coverage of what must have been a lengthy and very public trial.

1.
Seriously, you noticed the bandana but not their faces?
The bloody swollen face of the guy who hanged, how can it possibly be John's if all he did was staying outside hiding?
And Patrick couldn't have got so few bruises/ wounds if, as you said, he was kidnapped by the couple?

2.
Bandana is something John could totally have removed by the final day (the day he got re-captured).
Plus the one hanging was having some sort of cloth wrapping around his RIGHT KNEE, not at all the bandana you mentioned.

3. John had the left leg wound, which is why he was limping away from the police at the final chasing scene.
Patrick right foot was pretty much crushed, he definitely couldn't walk that far away from the shelter to the chasing place.

4. "Patrick escapes."
Okay so how did John have to hang himself in Patrick's position, when he could still run away? Please clear me up on this.