I live in Michigan and have sole physical custody of my almost two year old son. His father left well over a year ago for vacation to California and never came back. He is now telling me I have to let my son be around his family who are completely unfit, and that when he comes back he will be taking my son. I have also had threats from his current girlfriend of her taking my son from me also, and not legally. My sons father is on drugs, drinks alot, and has in the past been in and out of the hospital for being mentally unstable. He has two sisters one has a convicted felon of man slaughter living with her( who is off parole now), the other has child neglect on her record. His mother (my sons grandmother) also has child neglect on her record. I dont want to take my son away from his father I want him to have supervised visitation. What are my chances? and how do I prove these things?What is the name of your state (only U.S. law)?