Inheritance between a couple married without witnesses according to their former law upon their conversion to Islam.
Chapter on Distant Kindred (Dhawu al-Arham)
Al-Mughni
Book of Inheritance Shares (Farā'id)
Primary text
If a non-Muslim married a woman without witnesses, and subsequently one of them dies after their conversion, the survivor inherits from the deceased. This is the position of Abu Hanifa and Al-Shafi'i.
Supporting text
Zufar and Al-Lu'lu'i hold that they do not inherit from each other.