The twins

Angel and Hayden Komori are the twin sons of Yui Komori. She became pregnant with the boy when she was 19. Yui meet a man named James Damien. They got married 2 months before Angel and Hayden was born. At age 6, Yui died in a car accident. Angel and Hayden became quiet,closed up,distant,cold,antisocial,violent. When they received a letter from the vampire king, they were not happy. James was told by Yui that their father is a Sakamaki. They are 18 years old and its their months of Ryoutei Academy. Which brother is their father and why is Hayden and Subaru don't get along?