13.you are a runner and i am my father's sonAnd you are a runner
And I am my father's son

Regulus was heading to his next class when he saw his brother in the corridors of Hogwarts. He stopped right in his tracks. He didn’t care if he was going to be late to class. All that mattered was seeing Sirius. Regulus hadn’t seen Sirius since he ran away from home. His brother was joking around with his closest friend, James Potter. Regulus’ eyes narrowed as he glared at the two boys. He blamed arrogant Potter for ruining his family.

Regulus realized from that point on that he and his brother would forever be opposite sides of the same coin.