You need to consult immediately with an attorney in your area. As a non-parent, your rights over the child are very limited. The U.S. Supreme Court has held that parents have a Constitutional right to custody of their children. But, like most Constitutional rights, this right is not absolute - parents can lose it if they demonstrate that they present a risk of harm to the child.
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You can file a petition for guardianship over the child. You will have to provide notice to the parents of the child. You need to get your proof lined up in order to prove all of what you posted because without it, once the parents are served with the petition, the parents will likely shows up at your door demanding the child. You would have no legal rights to keep the child from them. That's why you need to contact and sit down with an attorney in your area of the state immediately to discuss this matter BEFORE you take any steps.
No attorney-client relationship has been formed by this answer. The answer given herein should not be your only inquiry into the matter or issue. You should schedule an appointment and seek the advice of an attorney to fully explain the facts so that the attorney can make an informed analysis and recommendation concerning your problem and advise you of all of your rights.