Well as Asif mentions, he is not Salauddin Qader Chowdhury's son.. He probably is Gias Kader Chowdhury's son. And I dont think there are any war crime allegations against Gias Q.Chowdhury (yet).
By the way, not that I lived there for too many years but if you are from Chittagong you would know that Raujan area is pretty much owned by the Salahuddin Kader Chowdhury and you cannot go against him but personally havent heard anything notorious about Gias Qader or Samir Q Chowdhur for that matter. They have been away from the limelights and minded their own business,,,