And for a answer to the second son, don’t push anything onto him either. The trick is, DONOT push anything onto either of him.
Ever heard of the phrase- trying to much-? They will see it, and latch on to it, as you said- they will test you. The second son will see you are pushing him to keep him away from his older brother, and he will resent it even more. Give both kids their space. If you see, your older son is influencing him too much, then is time to perhaps step in, and give a warning. But, if nothing is going wrong, then just let them be. Don’t be the ones to push your agenda on them, because both of them will resent it. Allow your older son to do what he does, but don’t say anything negative to your younger son that he is off the derech, or criticize him in any way. Your younger son will just become angry with you for “disowning” his older brother. Then, both will be lost. Give them space. They need it at this time. Teenage years is a time to try other things, it’s a faze. And if done right, will pass…