Because of the heritages of their parents , Mako is a firebender and Bolin is an earthbender .
Mako and Bolin are the sons of an Earth Kingdom father and a Fire Nation mother .
Because of the heritages of their parents , Mako is a firebender and Bolin is an Bolin .
Mako and Bolin are the sons of an Earth Kingdom father and a Fire Nation mother .