Non-Muslim
Question :

If a son or daughter of a Muslim leaves Islam and becomes an apostate, does he have the right of inheritance?

Answer :

The non-Muslim does not inherit from the Muslim.

Salafi and Non-Muslim
Question :

My maternal uncle has passed away, and we are not sure whether his relatives are still Muslims or not. We heard that one of them is atheist and the other is Salafi, but we are not sure if this is true. What should we do?

Answer :

One should be sure that those relatives are no long Muslims before excluding them from the inheritance. It is not sufficient to consider them as non-Muslims if they do not perform some obligatory worships, like prayers and fasts.
If the Salafi does not reach the level whereby he has hatred for the Imams (peace be upon them) themselves, he is considered a Muslim and he will inherit too.