How do I receive a copy of Dad's will?

New Jersey does not have a legal requirement to turn over a will.  Many states have a law that penalizes someone for destroying a will, but NJ does not have such a law.  The will would have to be registered in the county in which your father lived.  If your father ever dealt with an attorney for any reason, you might try contacting that attorney's office to see if they have done a will for your father - if he bought a house, for example, he might have gone back to the attorney that did the closing.  Even if she rips up the will, then your father died instestate or without a will, and then you and your siblings may still be entitled to a portion of the estate.