Relationships within the family are poorly understood , but Adasaurus seems to be a member of the subfamily Dromaeosaurinae , along with the Mongolian Achillobator and several North American species , including Utahraptor and Dromaeosaurus , after which the whole family is named . Relationships within the family are poorly understood , but Adasaurus seems to be a member of the subfamily Dromaeosaurinae , along with the Mongolian Achillobator and several North American species .