They changed the law in the 2011 tax bill to eliminate the 10 year statute of limitations on collecting government debts. The Republicans in the House approved this.
I don't see how that would be relevant to collecting "government debts" from anyone other than the debtor. Once the estate is settled, the government should have no further claim on the heirs, and the government should never have a claim on the children if the parents are still alive (short of overt fraud in which the parents' assets are titled in the children's names).