Here is the Crystal Empire Royal family from my NG verse, Heirs of Harmony

From Left to right we have

Draconus, Flurry Heart , Spike, Agape Heart (Agape), Empress Mi Amore Cadenza (Empress Cadence), Eros Heart (Eros), Shining Armor, Pure Heart and Rhythmic Beat (formerly: Rhythmic Heart)

This is the last family portrait that was taken before Rhythm renounced his title as Crystal Prince and left the Crystal Empire. Pure Heart knew he was planning to leave, which is why he looks so sad in the picture.

The Royal Family of the Crystal Empire are very loving and close knit, however even they have a few complications in their life.
Pure Heart, being one of Princess Twilight's students, as well as her apprentice and the Heir of Magic, he hasn't lived in the Crystal Empire since he was a child. In all technicality, because he is the heir of Princess Twilight's element of magic, he's not even technically a Crystal Prince anymore. However, Cadence and Shining are always determined to have their son in their family portraits.

Princess Flurry Heart, and her husband Spike are the next in line for the Crystal Empire throne, should anything happen to Cadence. Their son Draconus is terrified of the idea of possibly having to rule the empire one day.

Rythmic Beat abandoned his title and position as a Crystal Prince, to pursue his dream of being a singer in a band. He and his band mates now travel around Equestria performing for anyone who will listen.

The youngest of the Crystal Royal family are the twins, Eros and Agape. They are full of innocence and joy, and everyone in the Crystal Empire loves them and wants to see them grow up well.