I'm Doug, and I'm sorry to hear of the confusion. My goal is to provide you with excellent service today.
The leased vehicle will have to be turned in at the end of the lease. However, if the lease payments are not made because your son is unable to pay, then the car will be subject to being repossessed.
So that the car is protected from damage that would make your son liable for more than just the remaining lease payments, it would be wise to turn the car back in early to the dealership and let them deal with how they will recover the unpaid lease payments for the remainder of the lease.
If you son is expected to get out on bail in the near future, then it might be best if the vehicle remains available for him when he is released. However, if his release is unlikely in the next few months, the best move would be to get his permission to return the car to the dealer. However, the law does not require that the vehicle be returned at this time.
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I wish you and yours the best in 2015,