Do the children inherit their father's money acquired through illicit means after his death?

Unlawful wealth does not become lawful for heirs upon the death of its owner. Rather, they must return it to its owner if known. Otherwise, they should donate it as charity or spend it on matters benefiting Muslims. If lawful and unlawful wealth are commingled, the heirs must return the unlawful portion itself if identified. Otherwise, they should endeavor to determine its amount and return it to its rightful owners or donate it as charity. If the wealth is commingled and the proportion of lawful to unlawful is unclear, it can be divided into two halves.