You are legally a stranger to the son, as you are not related by blood or marriage.
In the current situation you might be able to file a case for custody, but as you are unrelated, the court may require notice to other family members, or place the child in foster care. If you want to take this route, you shoud get qualified as a foster care person, so as to avoid any delays in investigating your parenting abilities.
You really should find an attorney with whom you feel comfortable. I have handled such situations in the past and am open for new clients.
Answered on Sep 11th, 2015 at 9:47 PM