How can I change my visitation and move my court case to Delaware?

Because your original custody order was issued in New Jersey, that state retains what's called "continuing exclusive jurisdiction" under the Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA)—which both New Jersey and Delaware follow—until certain conditions are met. Typically, jurisdiction can shift to Delaware if: Neither parent (nor the child) lives in New Jersey anymore, or New Jersey finds that it no longer has a significant connection to the child and agrees to let Delaware take over. Registering the New Jersey order in Delaware is a necessary first step, but that alone does not automatically give Delaware jurisdiction to modify it. You may need to file in New Jersey first to either request a transfer of jurisdiction or seek a modification there if New Jersey still qualifies as the home state. Given the serious allegations about the father's behavior, you should also consider whether an emergency custody filing is warranted under Delaware law once the order is registered. That can sometimes temporarily override normal jurisdictional rules. These are complex jurisdictional and procedural issues, especially when your child's safety is involved. While my focus is as an appellate lawyer handling custody appeals and complex jurisdictional issues, I recommend working closely with a Delaware family law attorney who can coordinate efforts with counsel in New Jersey if necessary.