If he's pleading guilty without making a deal with the prosecution, then I think it's likely he is falling on his sword to protect his family. I would hope any investigation would include the family, and if there is enough evidence found to implicate them, they should be charged as well.
It irks me that the family should retain any wealth at all. They should lose virtually everything and be put in a position of starting over from scratch, assuming they don't go to jail too.
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