It would technically be just two to four
Sora
Data Sora
Xion
Roxas
Sora and Data Sora are obviously the original and a Data replica.
Roxas would be Soras Nobody so technically part Sora and Xion has her own connection to Sora.
Ventus and Vanitas are their own beings though with how connections work Vens looks managed to shape Roxas and vice versus Sora shapes Vanitus.
"He may be Mr. Clean, but his soul will always be dirty!"