Modern Japanese translation (synopsis): If a son or a grandson kills the foe of his father or grandfather, the father or grandfather (of the perpetrator of the killing) will be punished for the same crime (death penalty, deportation or asset forfeiture) regardless of whether such person was aware of the crime.
現代訳：（大意）子や孫が父祖の仇を殺した場合、（殺人をおかした犯人の）父や祖父がそのことを知らなくても同じ罪（死刑か流罪･財産没収）を課せられる。