Evil Siblings

"We share blood. But we are not brothers."

- Noob Saibot to Sub-Zero.

Bad Siblings are the type of villains who are related to the hero or heroine. And many stories bad siblings (most often older)  bully, threats, intimidate and abuse physically and mentally over good sibling considering him/her worse.

I other case, bad siblings (younger or older) can be jealous of a good sibling who is loved and praised by his/her family. For this purpose, he/she plans to get rid of good sibling, for example by killing him. On the one hand, bad siblings in the past were loved for good siblings, but a some tragic event may change him/her for the worse, blaming his/her own good siblings with a huge resentment.

Also Villain have own siblings, who helps in evil plans, but in other cases brother/sister of main villains serves as incompetent, bumbling and idiotic henchmen.

Literature

 * TBA

Animated

 * Scar (The Lion King)
 * Professor Screweyes (We're Back: A Dinosaur's Story)
 * Rameses (The Prince of Egypt)

​Live-Action

 * Loki (Marvel)

Animated

 * Wayne Cramp (Cramp Twins)
 * Terrence (Foster's Home For Imaginary Friends)
 * Amy (Total Drama Series)

Live-Action

 * TBA

Internet

 * TBA

Videogames

 * Vergil (Devil May Cry)
 * Noob Saibot (Mortal Kombat)

Anime and Manga

 * Itachi Uchicha (Naruto)