Write a formal letter to your adult child saying that he will no longer be permitted to dwell in your home after a date that is at least 30 days from the date of the notice. Have another adult hand your child a copy of the letter. Mail the letter to your child at your own address, certified mail, return receipt requested.
Obtain a form complaint for unlawful possession at the Landlord/Tenant Section of the New Jersey Superior Court, Office of the Special Civil Part. Go to the office in the county in which you live. Fill in the complaint if your child does not leave by the date specified in the notice. File the complaint with the same office. The court will stamp a hearing date and time on the complaint when you file it. Pay the fee for filing and service of the complaint.
Appear in court on the date and time set for the hearing. Bring the adult who served the papers on your adult child as well as a copy of the certified letter and return receipt. Explain the case to the judge hearing your case. If you prove your case at the hearing, the court issues you a judgment for possession.
Obtain an application for a warrant for possession form from the court where your judgment was entered. Fill out the form. If your adult child refuses to vacate after judgment against her, file the application and pay the applicable fee. The court issues the warrant for possession to a court officer who will serve it on the tenant.
Obtain an eviction application from the court. Fill in and file the application if your adult child still refuses to leave. Pay the court the eviction fee and arrange with the court office to evict your child. Arrange for a locksmith to change your locks immediately after she has been evicted.