The fuzzy memory syndrome isn't a complete wipe of all memories. From the perspective of those who stayed behind, you remember everything you did with them and everything they've done for you. The only thing that's been erased is their identity. You remember that you spent your life with...someone. You just can't remember their name and you can't remember their face or what they looked like.
In your situation, the FC members would remember that their former leader had a son, and would also know that he was a Warrior of Light because his identity has been wiped from their memories.
I hope that clears things up a little.
In your situation, the FC members would remember that their former leader had a son, and would also know that he was a Warrior of Light because his identity has been wiped from their memories.
I hope that clears things up a little.