What are the details on claims passing matrilineally for male-only titles?
Specifically, I had married the daughter of the King of France, and my heir gained implicit claims to the king's titles through his mother, although she herself did not have them because of the male-only gender law. I was hoping to press them and put my heir on the French throne, so when I died he would unite it with the rest of my realm. But the king died first and passed the title to his son, and now my heir's (the new king's matrilineal nephew) claims disappeared. With enough "helpful accidents," will I ever be able to get him back in the line of succession or close enough to have claims again, or will the title continue passing to more distant male-line cousins?