And then you have Sanctus Acies:
We believe that part of the soul will never make it to the "Hall of Heroes" but that part will be reborn in a cycle of life being added to your family when a new Noble comes forth to take your place, certain memories and actions will be the same as the family member departed.
I always found it funny that Indirik complained about the CoH when he had his character join SA.
Retaking the family name? That's fine, though I would personally rather see cadet branches replace the old family line.
Replaying a character? Well, I suppose it's alright so long as the previous character wasn't executed or otherwise killed. Though rerolling a character just because they were old seems tasteless.
As to the Fontan situation? A new character that none of your family has had interaction with? Poor role-playing. A character that immigrated and has a history that other characters in your family may have known? That is far more understandable. Especially if they have a letter of introduction from your kin.
The Acies "reincarnation" method where dead characters can simply be remade? Completely tasteless and against good roleplaying sense. Personally, I think if my character ran across this instance, he would likely view it as a grieving family member who lost their mind. Or a possession, in which case my priests would have to drive the spirits or demons from the body!