MIAMI — Sondra Wiener and Marvin Wiener, who reportedly lost millions in the investment scam run by Sondra’s brother, Bernie Madoff, were found in their home dead of gunshot wounds Thursday afternoon, Palm Beach County Sheriff’s Office said. “After further investigation it appears to be a murder/suicide,” PBSO said. Sondra Wiener was 87. Marvin Wiener was 90. The news was first reported by Boca News Now on Saturday. PBSO said deputies answering a 911 call around 12:55 p.m. Thursday concerning a man and a woman unresponsive in their home found the Wieners dead from gunshot wounds. Who shot whom…