According to the authentic Hadith they least one can say is that Sayyidina ŽAli, Sayyidatuna Fatima, Sayyidina Al-Hasan and Sayyidina Al-Husayn, radiya'Llahu Žanhum, are included. The opinion of Al-Imam At-Tahawiy (rahmatuLlahu Žalayh) was that it was specifically for Ahl Al-Kisa' as mentioned above. WaLlahu a'lam