>> picard: i believe that we can.to buy these houses, under the law, is called fraudulent transfers. >> safer: maybe, but the madoff sons are claiming they're still owed nearly $90 million by their father's bankrupt company. mark madoff and the other family members maintain their innocence and declined our request for an interview. >> i have no comment. i'm sorry, i can't help you. >> safer: but in a statement, the madoff sons say picard's allegations are "baseless" and that they had "no prior knowledge of bernard madoff's crimes." >> sheehan: if you were those sons, and you knew what you knew today about where all that money came from, wouldn't you be embarrassed to keep that money? they should give it all back. and if they don't give it all back, i think we have an obligation to go get it and take it all back. >> safer: and that includes mother madoff, ruth. though she has already agreed to forfeit about $80 million in assets, picard has sued to keep her on a very short leash. at the moment, any time she spends over