I'm sorry the judge didn't explain it to you.
There are two aspects to custody in New Jersey, legal custody and residential custody. Legal custody is who gets to make adult decisions for you (like elective surgery, where you go to school, etc). Residential custody means "where you live." It's possible a judge would order joint legal custody between your aunt and parents (you didn't say), which would mean they need to try to cooperate and communicate with each other on big decisions.
Residential custody just means you live with your aunt.
If the order doesn't specify it, your aunt has residential and legal custody of you.
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