Chosen One paladin familiar question

[Castilonium]

Say a level 5 sorcerer has a familiar with the Protector archetype. It has replaced its deliver touch spells ability with Shield Master.

Now say the sorcerer takes a level in paladin with the Chosen One archetype. A Chosen One's familiar has the Emissary archetype. But the Emissary and Protector archetypes are mutually exclusive, because they both replace deliver touch spells.

So what happens with the familiar? Does it stay a protector? Does it lose the protector archetype and become an emissary?

[Rycaut]

one argument could be that you can't take the Chosen One archetype. Not sure what the RAW ruling would be - in a home game I would probably replace Protector with Emmisary (perhaps also further ruling that one familiar literally replaced the other - much as if the first familiar had died and the PC paid the cost to replace her familiar.

[Chess Pwn]

It loses the protector and becomes an emissary. You MIGHT need to get a new familiar in the change.