My client is adopting 2 children and would like to offer supervised visits to the grandmother without a court order. Whom can she contact to do this?

I think this can be by agreement of the parties outside of the adoption, which would make it easier to stop the visitation if it proves to be harmful to the children.  Grandparents have very limited rights in New  Jersey.  If your client is willing to allow the grandparent to visit, then your client can set the terms of the visitation or can say there will be no visitation.  I don't believe that has to be part of the adoption.