Ok, thanks. If the parents of the best friend want to help him then they should help him file for emancipation
from his parents and then he can be in control of where he lives and his life decisions in general. In NM he just has to be age 16 to file or emancipation. Here is the statute from NM:
32A-21-3. Emancipated minors; description.
An emancipated minor is any person sixteen years of age or older who:
A. has entered into a valid marriage, whether or not the marriage was terminated by dissolution;
B. is on active duty with any of the armed forces of the United States of America; or
C. has received a declaration of emancipation pursuant to the Emancipation of Minors Act [32A-21-1 NMSA 1978].
32A-21-7. Declaration of Emancipation; petition; contents; notice; mandate.
A. A minor may petition the children's court of the district in which he resides for a declaration of emancipation as described in the Emancipation of Minors Act [32A-21-1 NMSA 1978]. The petition shall be verified and shall set forth with specificity the facts bringing the minor within the provisions of the Emancipation of Minors Act.
B. Before the petition is heard, notice shall be given to the minor's parents, guardian or custodian in accordance with the Rules of Civil Procedure for the District Courts [1-001 NMRA].
C. If the court finds that the minor is sixteen years of age or older and is a person described under Section 48 [32A-21-2 NMSA 1978] of this act, the court may grant the petition unless, after having considered all of the evidence introduced at the hearing, it finds that granting the petition would be contrary to the best interests of the minor.
D. If the petition is sustained, the court shall immediately issue a declaration of emancipation containing specific findings of fact and one or more purposes of the emancipation, which shall be filed by the county clerk.
E. If the petition is denied, the minor has a right to file a petition for a writ of mandamus.
F. If the petition is sustained, the parents, guardian or custodian of the minor has a right to file a petition for a writ of mandamus if he appeared in the proceeding and opposed the granting of the petition.
G. A declaration of emancipation granted in accordance with the Emancipation of Minors Act shall be conclusive evidence that the minor is emancipated.
So as you can see from the statute he has to petition the court for emancipation and the parents must be served with notice of the petition. There will be a hearing and he has to show why it is in his best interests to be emancipated, which based on what you have told me should be pretty easy. They can go to the family division of the local court and purchase the petition packet and help him fill it out and file it to begin the process. That is what I would recommend because if the parents then decide to bring him back home, he will have no legal ability to resist. I hope this helps.
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