My ex and I divorced in 2007- I was awarded custody of both our son and daughter in our Parenting Plan. In late 2010, my ex and I discussed an option of our son to live with her, on a trial basis, as he was having trouble in school. He is still having the issues, and the home life he is in is not very favorable for a child to be in. Do I have any right to just bring him back home? If no, what steps do I need to take to get him back?