The court-appointed trustee seeking to recover billions of dollars lost by jailed financier Bernard Madoff sued three entities Thursday to get back more than $30 million that he said the Madoff family had invested, mostly in oil and gas properties and technology companies.

The three lawsuits filed in U.S. Bankruptcy Court in Manhattan by Irving Picard are a follow-up to a lawsuit he filed in November seeking nearly $200 million from family members who he said lived lavishly while using the family finance business like a "piggy bank."

Picard wrote sarcastically in the latest lawsuits that Madoff was "quite generous" with the money he stole from thousands of customers in history's largest Ponzi scheme.

"Foremost among the recipients of Madoff's gifts of customer funds were his closest family members, including his wife Ruth Madoff, his brother Peter, his two sons Andrew and Mark and his niece Shana," Picard said.

"With respect to Mark and Andrew, the lawsuits are without merit, both factually and legally," said Martin Flumenbaum, a lawyer for Madoff's sons.