A former associate at Thacher Proffitt & Wood faces up to five years in prison after he pleaded guilty Thursday in Eastern District of New York federal court to an insider trading scheme involving his father, brother and a childhood friend who worked at Ernst & Young.

The 29-year-old attorney, Amir Rosenthal, his co-defendants and several others named in a civil securities complaint earned as much as $3.7 million by trading on inside information provided by Rosenthal’s 62-year-old father, Zvi, a former executive at Taro Pharmaceutical Industries, Ltd., according to prosecutors and the Securities and Exchange Commission.