About Kazim Avci
Told by the sources

Kazım Avcı, a nephew of Gülen and reportedly one of his "imams" was also among detainees. (1)

The suspects Kazım Avcı, Ali Çelik, Dilaver Azim, and İlhan İşbilen were detained earlier on Dec. 11 in a major operation across Turkey against the terror group. Following their testimonies at the prosecutor's office, the suspects were referred to the Ankara court of peace on duty, where three of them were arrested. (2)

..........İşbilen was detained earlier this month, along with Kazım Avcı, Gülen’s cousin who suffers a crippling disability which affects 68 percent of his body, as part of the same investigation. Two of the suspects were released as it was realized only after the interrogations that there had been a mix up with their names. (3)

(1) hwww.dailysabah.com/d/travel/2015/12/12/crackdown-targets-prominent-gulenists-in-terror-probe

(2) www.dailysabah.com/politics/2015/12/14/3-people-including-ex-deputy-isbilen-arrested-in-ankara-in-gulen-terror-group-probe

(3) http://policy.dfns.net/2015/12/28/arrest-warrants-issued-for-cleric-fethullah-gulen-and-60-other-suspects