Legal Question in Wills and Trusts in New Jersey

Whether it's "legal" or not isn't the issue...The better question is "why" would someone sign the will if he/she knows they have adopted a child?? Was this an intentional declaration? A mistake? Does it perhaps show the testator didn't understand what he/she was signing? Were they competent?

There is no law against what you say in a will - for the most part, you can say whatever you want. However, what you say can be used to assess or contest the legitimacy of the will. Many times, if a person wanted to disinherit a child from a will, the lawyer drafting the will makes sure to list the name of the child - and that the person specifically does not want to leave anything to that child. It helps to assure that some child was not missing as an oversight, or a mistake.