Here’s the update! 

First Generation:

(Human) Flash Sentry and Sunset Shimmer

• Parents of Lightning Star and Flare Sword
  
• Aunt and uncle of Starfall Shimmer, Galaxyburst, and Violet Nova
  
• Dated in High School, later got married
  
• Live in the human world where Flash’s band is famous and Sunset is a comic book writer and illustrator
  

• Sunset a was told she is Starlight’s sister by their mother, Violet Sun(not Shown) 
  
  Starlight and Star Tracker

• Parents of Starfall Shimmer, Galaxyburst, and Violet Nova

• Aunt and uncle of Lightning Star and Flare Sword

• Star Tracker enrolled in the School of Friendship, where he and Starlight grew close

• (Adult) Star Tracker gained a crush on Starlight and eventually asked her out, they dated for a few years, then got married

• Starlight became Twilight’s assistant after Spike left Ponyville to be with Ember

• Star Tracker is head of the gaurds in Twilight’s castle

• They live in the Castle of Friendship

• Starlight was told she is Sunset’s sister by their mother Violet Sun

Rarity and Spike

• Not married 
  
• Parents of Fire Diamond
  
• Had a one-night stand, were never really in a relationship
  
• Rarity later gave birth to their daughter, Fire Diamond
  
• Spike was perfectly fine with being a father out of wedlock, and loves Fire Diamond fiercely 
  
• Spike later gained interest in Ember, and began to spend more time with her 
  
• Rarity started dating as well, though she dated the more popular stallions which she wasn’t really in to 
  
• Rarity and Spike are still good friends

Rarity and Comet Tail

• Married 
  
• Parents of Constelllation and Cream Thread
  
• Aunt and uncle of Rough Rhythm
  
• Rarity and Comet Tail became friends when Rarity wanted some astronomy inspired dresses for a new line and sought out Ponyville’s best known astronomer
  
• Comet Tail gained a massive crush on Rarity, but didn’t know how to tell her (this was when she was dating)
  
• Fire Diamond (who was 10-12 at the time) over heard Comet Tail talking about wanting to ask Rarity out, she told him about it and helped him win Rarity’s heart
  
• Comet Tail loves Fire Diamond as if she were his own

Spike and Ember

• Not officially married, but have sworn their love for each other*
  
• Parents of Candle and Nightflare
  
• Spike left Ponyville to be with Ember and Starlight became Twilight’s assistant
  
• Live in the Dragon Lands
  
• Frequently visit Ponyville to see Fire Diamond

Sweetie Belle and Rumble

• Married
  
• Parents of Rough Rhythm
  
• Aunt and uncle of Fire Diamond, Constellation, Cream Thread, Storm Spice, and Ocean Cloud
  
• Sweetie Belle became a singer and Rumble is a Wonderbolt

Next Generation:

Lightning Star

• Only daughter of Sunset and Flash
  
• Pegasus
  
• Sister of Flare Sword
  
• Cousin of Starfall Shimmer, Galaxyburst, and Violet Nova
  
• 16 years old
  
• Does not get along with Starfall
  
• Lives in the human world, though visits the pony world to see family

Flare Sword

• Only son of Sunset and Flash
  
• Unicorn
  
• Brother of Lightning Star
  
• Cousin of Starfall Shimmer, Galaxyburst, and Violet Nova
  
• 14 years old
  
• Is competitive with Flare Sword
  
• Lives in the human world, though visits the pony to see family

Starfall Shimmer

• First born daughter of Starlight and Star Tracker
  
• Unicorn
  
• Sister of Galaxyburst and Violet Nova
  
• Cousin of Lightning Star and Flare Sword
  
• 21 years old
  
• Starlight and Star Tracker announced their pregnancy at a party
  
• She is named after Sunset Shimmer, her aunt
  
• Future wife of Vortex Thunder (son of Tempest and Blueblood)

Galaxyburst

• Second born and only son of Starlight and Star Tracker
  
• Unicorn
  
• Brother of Starfall and Violet Nova
  
• Cousin of Lightning Star and Flare Sword
  
• 19 years old
  
• He is named after Sunburst, Starlight and Sunset’s cousin
  
• Future husband of Asteroid Glow (daughter of Twilight and Big Mac)

Violet Nova

• Third born and second daughter of Starlight and Star Tracker
  
• Earth Pony
  
• Sister of Starfall and Galaxyburst
  
• Cousin of Lightning Star and Flare Sword
  
• 12 years old
  
• She is named after her grandparents, Violet Sun and Novastar
  
• She’s a jerk and a bully
  
• Future wife of Cream Thread (son of Rarity and Comet Tail)

Fire Diamond

• Only daughter of Rarity and Spike
  
• Unicorn/dragon hybrid
  
• Half sister of Constellation, Cream Thread, Candle, and Nightflare
  
• Cousin of Rough Rhythm (I forgot the line cries)
  
• 23 years old
  
• Was conceived from a one-night stand
  
• She loves her stepfamily dearly
  
• Was crushed when Spike left
  
• Future wife of Blazing Silk (son of Photo Finish and Starstreak)

Constellation

• Only daughter of Rarity and Comet Tail
  
• Unicorn
  
• Half-sister of Fire Diamond and sister of Cream Thread
  
• Cousin of Rough Rhythm
  
• 15 years old
  
• Is the apprentice of Twilight Sparkle
  
• Future wife of Airway Apple (son of Applejack and Soarin)

Cream Thread

• Only son of Rarity and Comet Tail
  
• Unicorn
  
• Half-brother of Fire Diamond and brother of Constellation
  
• Cousin of Rough Rhythm 
  
• 12 years old
  
• Is interested in clothes making
  
• Future husband of Violet Nova

Candle

• Only daughter of Spike and Ember
  
• Dragon
  
• Half-sister of Fire Diamond and sister of Nightflare
  
• No cousins
  
• 17 years old 
  
• Is more like her father 
  
• Good friends with Fire Diamond 
  
• Future mate of Simmer (son of Garble and Spitfire)

Nightflare

• Only son of Spike and Ember
  
• Dragon
  
• Half-brother of Fire Diamond and brother of Candle
  
• No cousins
  
• 15 years old
  
• Is more like his mother
  
• Future husband of Pink Mac (daughter of Twilight and Big Mac)

Rough Rhythm

• Only daughter of Sweetie Belle and Rumble
  
• Pegasus
  
• Has a brother or sister on the way
  
• Cousin to Fire Diamond, Constellation, Cream Thread, Storm Spice, and Ocean Cloud
  
• 7 years old
  
• Has stage fright
  
• Future wife of Batter Blitz (son of Scootaloo and Pound Cake)

*Okay so about the dragons not being married, I want the creatures to go back to their animal roots a little. The only species in the Mintiverse that has marriage are the ponies. Recall that Torch and Novo have kids, but their other parents aren’t mentioned. Plus, some species (like griffons, dragons, changlings, etc) weren’t really that friendly with each other, so I feel like marriage would just be used to reproduce, so there wouldn’t be a reason to keep the pair legally bound together. This isn’t to say everyone got with everyone, and I’m sure some couples did stay together and some actually cared about each other. Also, I don’t approve of this in real life or with humans. Remember, these characters are still animals, sentient animals, but still animals, humans are not. ~ Mintstar