Bernard Madoff’s brother, sons and a niece used the family finance business like a “piggy bank,” a court-appointed trustee charged Friday as he demanded in a lawsuit that they return almost $200 million in money to be distributed to cheated investors.

The trustee, Irving Picard, sought $198.7 million from Madoff’s brother, Peter, who had worked at Madoff’s Manhattan investment company since 1965, and sons, Mark and Andrew.