The Power

Luke is an evil villain with many super powers.  They live in ancient Japan, back when swords were the main weapon used.  His good brother has two sons.  Their entire family is gifted with power, but eventually the villain catches his brother unguarded, where the brother gets slaughtered mercilessly.  However, he has two sons which he sends to his father to be cared for.  The two boys grow up not knowing they are part of this magical family, until their grandfather explains to them their great power.  Then he trains them in the way of the ninja.  They eventually go after their evil uncle.