Bismillah.

Salam alaikum, I do believe this going to be some kind of surprise for majority of shias.

Your shaykh, ibn Babaweyh al-Qummi, which was Saduq in accordance to you, said in his book “al-Khisal” (p 158):

Translation:

The compiler of the book – may God be pleased with him – says, “I heard my shaykh Muhammad ibn al-Hassan – may God be pleased with him – narrate that As-Sadiq (alaihi salam) said, ‘Zubayr was one of us -Ahlalbayt, until his Farkh (1) grew up and turned him from his view.’”

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1) Muhaqiq said: He meant his son Abdullah.

Farkh = Little chicken (or bird).