Improper supervision of a family member was an offense under the Ferengi Trade By-Laws; specifically, subsection one thousand twenty seven, paragraph three. Under the bylaw, Ferengi were held responsible for the crimes of those family members whose lives were under their care, however remote.
In 2371, Quark was charged with improper supervision of a family member, namely, his mother, Ishka, who had earned profit, something Ferengi females were forbidden to do. (DS9: "Family Business")