"My brother's an asshole, plain and simple. That doesn't mean you can fuck with him. That's my job."
―Kate to Mary[src]

Kate Coragail (born August 10, 1995) is Steve's younger sister. The night that CiCi broke the curse, Kate, Helen and Alex went to Cole's house so that Helen could fix her relationship with Steve. Instead of killing her, Mary trapped her inside the mirror to lure the others inside. She, along with Steve and Alex, were the only survivors of Mary's tyrade. Alex confessed his love for her and they eventually became engaged. Kate and Steve remained close.