Please Help me in this Discussion with a Shia!

[Rationalist]

The same is true of the family of Mohammad

So all non-12er Shia are kaffir now?

[Ibn Yahya]

I'd just like to point out.the circular logic in the argument that the "Twelvers are right because they know their twelve Imams". I mean that's kind of why they're Twelvers. A good counter to that argument would be that it was not always obvious to the Shi'ah what the number of Imams would be or who they were. If you remember the majority of Imam Musa ibn Ja'far's Shi'ah became Waqifis and said the Imamah ended with him