In Massachusetts if you decide to hire a new attorney, typically what happens is that new attorney files something called a “Notice of Appearance” providing that to your prior attorney and that attorney would file a “Notice of Withdrawal”.  I would send all the relevant paperwork in your file to your new attorney. So, you can certainly tell your prior attorney that you are hiring someone new but you can also have your new attorney once you have retained them, do the paperwork and notify your prior attorney in a divorce or custody case.