Administering an estate following an unlawful killing - forfeiture

In a case where a parent was unlawfully killed by their child, and died without leaving a Will, would the deceased’s siblings need to apply for directions from the Court before distributing the deceased’s estate, following the public policy of the Forfeiture Rule - i.e. by treating the child as though they predeceased the parent?

The child has been convicted for more than 3 months and has not made any attempt to dis-apply the Forfeiture Rule.

Any guidance would be greatly appreciated.