A woman accused of plotting with her ex-boyfriend to murder her own grandparents at their Fort Lauderdale home in a suspected inheritance scheme has entered a plea of not guilty. Claudette Melvin, 85, and her husband, Major, 89, were peaceful, doting grandparents and great-grandparents who appeared to have no enemies, family members said, living out their days inside their quiet home in the shade on Southwest 30th Terrace.