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Hi Jenny. Yes, 吳吉旺 (Wu Ji Wang) is the name of Wu Zun's elder brother. According to the news below (link,) Wu Zun even helped pick a showbiz name for his big brother, the name of which is Wu Wang (吳旺).

Unfortunately, no photo of Wu Ji Wang can be found in the net. The news article below was dated Sept. 17 this year, and so I believe Wu Ji Wang is just starting on the road to stardom. You may have to wait for a while before he's popular enough to have pics in the web.