They family both owned and controlled (in the sense that the board was stacked with family members) the company that manufactured OxyContin. The _company_ has been found in prior cases to be liability for criminal marketing practices leading to deaths. This has ultimately lead to the company going bankrupt under all it legal obligations as fallout from various suits.

The family is losing their equity in the bankruptcy. The question is if the family, as both owners and/or directors of the company, need to give back funds they received as dividends from the company, back to the company (under the bankruptcy courts guidance to give out to its creditors, including parties owed money due to harm).

There hasn't been a specific criminal case against the family, so the prosecutors can't just seize the profits as proceeds of a criminal enterprise. But the family clearly benefited from and directed a company the willfully sold opioids that lead to the deaths of so many, and the corporate malfeasance is something that has been adjudicated.