If your ex has custody, then it may only be necessary for her to file notice of intent to move with the court. (oureverydaylife.com)
The parent who intends to move must give a 30 - day written notice of the intent to move. (divorceland.com)
Depending on the entity you are suing, there may be a notice requirement, where you are required to give notice of the intent to sue within mere months. (illinoislawyers.com)