Insanistis and Sanus, the twins of nonsense

[SapphirePony]

Name: Insanistis
Gender: Stallion
Species: Unicorn
Age: 16
Cutie mark: half of a heart with the colors of a yin-yang sign.
Appearance:

Spoiler: show

 

Name: Sanus
Gender: Mare
Species: Pegasus
Age: 16
Cutie mark: half of a heart with the colors of a yin-yang sign, opposite colors/design of her brother
Appearance: *pending*

Insanitus and Sanus are a strange two, they say they are twins but, they are a pegasus and unicorn so some won't believe them until they see the family portrait of them, although... they are orphans, Insanistis likes to say that discord is their father but Sanus always declines that and says that their mother was a pegasus and their father was an unicorn. Sanus is known to try to keep peace between the two, with them being complete opposites of each other. *you guys can come up with the rest of their story  *