The campaign finance law passed by its own party in a salvage job following the Adscam scandal targetted, among other questionable practices, laundering corporate donations through execurives and their family members.
This has a distinct aroma of just such a practice. More than $100,000, amounting to 70 percent of the funds raised by his campaign came from executives and family members of one generic drug manufacturer, including teenage children, two of whom were just shy of their 12th birthday/
So, instead of divesting his campaign of the whole of the more than $100,000, he returns only that part which came from the minors.
Reminds me of the monkey trap. That was a jar containing bait attractive to monkeys. The opening of the jar was sized such that a monkey could get his open hand into the jar but could not withdraw his closed fist. So once he had grabbed the bait he could not escape unless he let go of it.