what is the definition of Ahl ul Bayt

DD bro/sis (if you are basing it on dexter then Sis) Pagluu has answered your question.

Can I, or any shia deny that the wives were not part of the family?** Absolutely not.

**However, it is the term Ahlul Bayt in the special chosen context of infallibility that we say that only Ali, Bibi Fatimah, Hasan and Husain are part of Ahlul Bayt.

Likewise brother Ibn Sadique raised the following point.

Brother, you are right but in the general meaning of the family - the Son, whether believer or not, is definitely part of the family. Hence I feel you are in agreement that the definition of the term Ahlul Bayt has a special contextual meaning.

[quote]

This wife of Hz. Noah (as) and that of Hz. Hz. Lut (as) were unbelievers and were false to their husbands.

Care to tell which of Prophet’s wives were unbelievers?

[/quote]
Muslim - Book 001, Number 0141: * Zirr reported: 'Ali observed: By Him Who split up the seed and created something living, the Apostle (may peace and blessings be upon him) gave me a promise that no one but a believer would love me, and **none but a hypocrite would nurse grudge against me*.
This is a hadith from one of the most authentic books of Hadith for Ahl-e-sunnat. I will leave my argument here to answer this point.