please forgive me if i am out of line, i only skimmed this and totally agree w/the 'sux' commentary, as well as the Mean Lawyer, and contacting all the powers that be advice, but what if the relationship w/the 16 year old really ISN'T at stake.
we are talking a man-child here who quite possibly got in over his head and now is living a trauma that he will remember the rest of his life.
is there any way to coach mom on how to more effectively speak to her son and find out where he stands on all this?
it is, to me, very possible that he doesn't know what he wants, was manipulated by the other parent and now is in a state of overwhelm.
if mom can remain in a neutral place, speak w/son in a safe place, i.e., at home when she takes the other parent's offer of week-end visitation, and find out what he is really thinking, wanting, it could very well work to his advantage.
focusing on not coming across angry, hurt, accusing, bitter or in any way any less loving towards the child she has so painstakingly raised will model for him a grace and favor in the face of adversity that he is OBVIOUSLY not getting from the other parent.
when i have worked with people in this kind of situation i have helped them come up with open ended questions that do not have a 'yes' or 'no' response, do not focus on the needs of the parent, and let the young person know that they are loved as well as acknowledges that they are growing up, wanting to make their own decisions and not always able to fully comprehend the results of their choices.
also, when in a situation like this, young people aren't always able to cough up what is really going on right off the bat. sometimes it takes a bit. more then one conversation approached from more then one (loving, patient) avenue. this is difficult because it is easy to get into 'drilling' and/or 'leading' or even considered 'ranting'.
but it can be done.
if the young person feels safe, in fact the safer a young person feels, the more prone they are to open up and spill what is really going on for them.
from what her lawyer said i get the impression that this kid got in over his head and now has no clue how to extricate himself from this mess. if mom can help him find a bridge it would really solidify even more their relationship.
for what this is worth. i may be so far off base as to be laughable.
but i do know that kids don't alwasy know or understand what they are feeling or how they helped create the mess they find themselves in.