CM,
You still have not responded to the question I asked. What would your response be to a 12, 13, 14-17 year old teen ager if the became rebellious one Sunday and refused to go to Mass?
If they have they have a good upbringing, and are aware of what they are doing, and what it is wrong, then its rebellion.
Forcing a child to do one thing or another always seems to backfire, at least by the teens age. You force them to go, they won’t be receptive to the messages in the Scriptures, or the Priest’s homily. They won’t acknowledge Jesus in the Eucharist; if they harden their hearts so. So forcing them to go could well “force” them into a state of mortal sin. Catch-22?
In such a case, you have to play with them for a bit. Ask what is good about NOT going, what benefits does it have now, and for eternity. I know young teens (like anyone) cannot comprehend their eternity well. But they at least consider God vs. No God. Then you have to decide whether or not taking them to Mass is really going to be of benefit.
As I said above, if they harden their hearts, they could well be committing a mortal sin anyway (i.e. Sacrilege). If they don’t go, you perhaps burden yourself with sin, but also them.
In the end, it may be beneficial to let them choose between God and the world. If they fall away, then we are accountable, but we have to make sure this doesn’t happen - in such a case, what I said in the previous post, the personal encounter, is what will (hopefully) cure their rebellion.