In most cases, if the child is under 18, they will be subject to the court precedents mentioned above, and USCIS must follow them. This means that a parent’s abandonment of LPR status will result in the child’s green card becoming invalid. For children aged 18 to 21, it depends on whether they are still under parental custody and control. They may or may not be affected. Once a child has turned 21, they are completely unaffected by the parent's decision to abandon permanent