Who is the 4th person?

[Serena Moonsilver]

No: HPFGUIDX 54435

Finwitch said:
> But I have one guess of this person's identity:
> 
> Romulus Lupin, a twin-brother to Remus Lupin, who went to 
Durmstrang, 
> thus explaining partly why Sirius doubted Remus to be the traitor 
AND 
> Sirius' extreme care about Durmstrang students later?
> 

Possibly, but why would their parents send them to different 
schools?  It seems like if Dumbledore was willing to take Remus he 
would also take his brother.

Serena