Yusuf Ibn Asbaat (rahimahullaah) said:

”My father was a qadari and my maternal uncles were rawaafid (shia), and Allaah saved me through Sufyaan (i.e. guided him to the Sunnah through Sufyaan)”

[Quoted by Shaikh Jamaal Ibn Fareehaan al-Haarithi (may Allaah preserve him) in لم الدر المنثور   page 142, and its original reference is in Taareekh Dimashq 8/79]