There is confusion whether his father was As'ad bin Zurara or Sa'd bin Zurara. Based on my research, it seems that As'ad bin Zurara had no son and most probably 'Abdullah, 'Abdur Rahman and Yahya are sons of As'ad's brother Sa'd bin Zurara.
Thiqat Ibn Hibban - ثقات ابن حبان [Companion (RA), Id:790. - pg:Vol:3] عبد الله بن أسعد بن زرارة الأنصاري وكان أبوه سيداTaqrib al-Tahdheeb Ibn Hajr - تقريب التهذيب - ابن حجر العسقلاني [, Id:. - pg:]
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