Bengaluru, Aug 18 : A man and his son were arrested on charges of sexually assaulting a five-year-old boy, police said on Friday. The incident was reported from Kamakshipalya police station limits in the state capital. The 55-year-old accused has been sent to judicial custody in connection with the case and his minor son has been sent to an observation home. Police said the victim boy is a relative of the accused. The accused had sexually assaulted the child many times. The mother of the victim, a relative, used to leave the child at the residence of the accused and go for work. The accused had made the child believe that their act of sexual assault was a game. The crime came to light after the child developed an infection. The mother upon noticing it took her to a doctor. The medical tests confirmed the sexual assault on the victim child. /IANS