Asher is the younger brother of Michael.
Season 1
Asher ended up becoming one of the victims of a shtriga hunting in his home town. Asher's older brother Michael witnessed the attack but assumed it was just a nightmare. After realizing that Doctor Hydeker is the shtriga, the Winchesters ask Michael to help them kill it by acting as bait. In order to save Asher, Michael agrees. With the help of Michael, the Winchesters kill the shtriga and Asher recovers. His mother tells Michael and the Winchesters he will be kept overnight at the hospital for observation but will be just fine.