Stories of two brothers, sometimes twins,  who oppose each other abound in myth and legends including religious ones.  Cain and Able in the Bible, Romulus and Remus who founded Rome according to legend, Osiris and Set from Egyptian mythology, Ormuzd and Ahriman in Zoroastrianism, Vritra and Indra from the Vedic tradition, and others.   The Caddo tribe of Native americans have their legend of Village Boy and Wild Boy who become thunder and lightning.   The Xingu people of Brazil have the legend of twin brothers Kuat and Iae, who forced the vulture king Urubutsin to give light to the dark world.  
    All of these pairs of brothers represent the opposing powers of Light and dark,  spirit and matter.  They also symbolize the many opposites that exist in the world od duality:  male and female, hot and cold, positive and negative, yin and yang, good and evil. 
    Greek mythology has a slight variation of the brothers mythology:  Apollo and his sister Artemis are twins.  He is the god of music, light, and medicine and is responsible for carrying the sun through the sky in his chariot.  Artemis is the goddess of hunting and wild things.  She is associated with the moon.  Clearly, this pair also represents the dual forces.