There was a previous question about possible nullifiers of Islam concerning a parent and inheritance. Must the son actually seek out a Muslim judge for a ruling, or may he leave the matter unresolved and continue treating his father as Muslim for inheritance? If both are allowed, which is better?

Ustadh AbdulAziz al-Haqqan

In rulings regarding such matters to rule disbelief on an individual, you should seek out a mufti or Muslim judge.