Hadith.5730 - Ibn Abi Umayr narrated from Ibrahim ibn Abd Al-Hamid who said
I asked Abu Abdullah (as) about a Christian man who accepted Islam and then reverted to Christianity and died.
Imam (as) said: "His inheritance goes to his Christian children."
I then asked about a Muslim who converted to Christianity and then died.
Imam (as) said: "His inheritance goes to his Muslim children."