Everyone knows who the infamous group called the Marauders are but what about there siblings. Sirius Black's younger brother by one year Regulus could be described as cold and cunning most would call him the perfect Slitherin. Remus Lupin's younger sisters by one year twins. Kathleen and Riley are total opposites while Kathleen can be described as the kind and gentle Hufflepuff girl. Riley is described as just a moody bitch by most she already felt like an outcast but being sorted into Slitherin it just gets worse for her. Follow them through there 6th year at Hogwarts in pretty little phyco.