Yes, she is Princess Celestia's adopted niece.
No. Looking at the flashbacks to when Twilight was a filly, Cadance is noticeably younger. This suggests that she is relatively young, meaning that whe would have been born some time during Luna's 1000 year banishment as Nightmare Moon. The description of Cadance as Celestia's niece is not meant in the literal sense of the daughter of a sibling. If you believe the story in the book Twilight Sparkle and the Crystal Heart Spell, then Cadance is not even related to Celestia by blood, but was essentially adopted.
Princess Luna became jealous of Princess Celestia and tried to take full control of Equestria and bring everlasting night. Celestia was forced to banish her to prevent this.
She is the daughter of Princess Cadance and Shining Armor.
She is officially Princess Mi Amore Cadenza, but in most cases she goes by Cadance.
Princess Cadance marries Twilight Sparkle's brother, Shining Armor.
No. Looking at the flashbacks to when Twilight was a filly, Cadance is noticeably younger. This suggests that she is relatively young, meaning that whe would have been born some time during Luna's 1000 year banishment as Nightmare Moon. The description of Cadance as Celestia's niece is not meant in the literal sense of the daughter of a sibling. If you believe the story in the book Twilight Sparkle and the Crystal Heart Spell, then Cadance is not even related to Celestia by blood, but was essentially adopted.
Yes, Princess Celestia, Luna, and Cadence will get their magic back since the main 6 defeated Tirek and have been rainbowfied to help Equestria receive their magic back. If you want to watch it you can on Youtube or Dailymotion
No. Only four princesses have been named in the show: Celestia, Luna, Cadance, and Twilight. Princess Papillon appears to have been an alternate version of Queen Crysalis created by the show's fans.
Princess Celestia
Princess Cadance is Stella Jang and she is awesome! Moo.
So far there has been no mention of how Luna and Celestia came to be.
Princess Luna became jealous of Princess Celestia and tried to take full control of Equestria and bring everlasting night. Celestia was forced to banish her to prevent this.
Yes she is.
She is the daughter of Princess Cadance and Shining Armor.
She is officially Princess Mi Amore Cadenza, but in most cases she goes by Cadance.
Princess Cadance marries Twilight Sparkle's brother, Shining Armor.
Like her sister Princess Luna, Princess Celestia is what the fans call an alicorn. Offically the princesses are all three races at once, equally an earth pony, pegasus, and a unicorn.