𝐓𝐕𝐃 𝐈𝐌𝐀𝐆𝐈𝐍𝐄𝐒

His reaction to your sibling(s)

Kol: One day, you and Kol were out on a date. A younger looking boy happens to walk to you and you immediately freeze. At first, Kol was worried, he perceived the boy as a threat but then, you smiled a gigantic big smile and you run to the boy and hug him. Kol seethes in jealousy but then you introduce him to the boy. "Kol, this is my little brother!!!" you chirped and he immediately warmed up to the boy. He even started to cry because he remembered his own little brother Henrik. It was an emotional experience and your little brother finally got to meet the happy homicidal maniac. 

Damon: You never told Damon that you had another sibling, a little sibling to be exact. The reason you didn't tell him was because well, your little sibling happened to be Tyler Lockwood and Damon didn't really like Tyler. Tyler and you didn't look alike at all, Tyler was a big jerk and you didn't want to be associated with him. Tyler wanted to get back at you because he was now a hybrid and no longer human. He told Damon that you two were brother and sister and boy was Damon upset. "HOW COULD YOU NOT TELL ME THIS??!!" Damon shouted furiously, "I was trying to spare your feelings" I said tearing up. "If there can't be any honesty in this relationship then maybe there should be no relationship at all" Damon said and stormed out. He didn't like the fact that you had a little sibling especially since it was Tyler. 

Stefan: Your siblings happened to be the mighty Vicky Donovon and Matt Donovon. You moved away from Mystic Falls at a young age but returned after your sister died. From then, you were living with Matt all along but the Salvatore brothers were completely unaware of your existence and the fact that you were a Donovon. You are the youngest sibling and when you go with Matt to drop off something at the Salvatore's house, they were in for a surprise. "Who is this cutie!?" Damon said smirking and Matt kicked Damon. "Damon be respectful! Who is this?" Stefan said with curious eyes. "It's my little sister, Y/N" Matt said. "WHAT?!" they both said. "So there's another baby Donovon besides you" Damon said. Stefan was looking at you deeply, he looked intrigued by you and wanted to know everything about you. You guys hit it off your first time meeting each other.