In the United States it would not be legal. You haven't included any details about the relationship between the child and the unrelated adult who wouldn't be able to enroll the child in school or obtain medical treatment. That would set the stage for the adult and child to have to lie about the child's status. There is a concern that taking unofficial custody of an undocumented orphan could set the stage for child abuse. If and when the authorities are alerted, the Department of Child Services would take custody of the child and place her/him in foster care and the unrelated adult might be the subject of an investigation to determine why they didn't report the child's situation to the proper authorities.
The adult with whom the child is living should visit the probate court and petition for a legal guardianship. If possible they should consult with an attorney who specializes in custody issues.
no possible way you can get all the pices but cant make it
No.
none without court order
Yes, depending on how much time has passed and other factors. If the child has been abandoned the grandparents have a good chance of obtaining a permanent guardianship. They should consult with an attorney who specializes in custody issues.
Not without the approval of the courts.
Unlikely because the act is adversarial.
No. Only the court could make that decision.
Yes, since it is unrelated to gravity.
Fermentation
Not unless your grandparents are granted custody/guardianship by the court.
In Missouri, to revoke voluntary temporary guardianship of a minor without going through the courts, you would need to submit a written statement revoking the guardianship agreement to all parties involved. It is recommended to consult with a lawyer to ensure the proper steps are taken and to protect your legal rights. Keep copies of all documentation related to the guardianship for your records.
In NYC, you are allowed to sell artwork and literature without obtaining a vendor's license.