Trustee Irving Picard is poised to file civil complaints against Madoff's two sons Mark and Andrew - who ran their father's trading division - and Peter Madoff, Bernie's brother and company's chief compliance officer, reports CBS News chief investigative correspondent Armen Keteyian.
Video: Tour Inside Madoff's Montauk Home
One source says Picard will seek in excess of $50 million - including at least $30 million in loans to the sons. He is not accusing them of wrongdoing; instead his goal is to recapture money diverted from Bernie Madoff's massive Ponzi scheme.
"He's trying to get money back for the benefit of creditors from people who weren't entitled to receive it," said bankruptcy attorney John Kinzey.
Other sources say Picard intends to force the Madoffs to reveal all their assets - everything from bank accounts to fancy homes, including one on Nantucket Island bought by Mark Madoff and his wife for six and a half million dollars in cash. It was bought with money directly transferred, CBS News has been told, in June of 2008 from the bank account of Bernie Madoff Investment Securities.
Photos: A Closer Look Inside Madoff's Montauk Home
We wanted to ask Mark Madoff about the potential civil lawsuit.
We caught up with him and his wife on the streets of New York where his wife took exception to our question.
Mark Madoff would only say "no comment" before scrambling away.
In a statement, a lawyer for the brothers said they had no knowledge of the fraud, are the ones who turned their father in, and continue to cooperate fully with authorities.
Still, it may not prevent Picard from going after every asset Bernie Madoff gave to any member of his family.