my husband mother died and her spouse is still alive at 96.. my husband was the beneficay and the will was changed 4 days after death to the grandson

A Will can only be changed during the testator's lifetime. Your husband should seek out an attorney who practices in the field of probate. He or she can assist him with determining his interest in the estate. Astrid de Parry, P.A. 107 E. Church St. DeLand, FL 32724