This is Starlight and Trixie’s family in my nextgen. I’ll cover what happened first, and then the characters I have here. For the adults, I’ll cover the changes from the canon, and the kiddos will have a brief summary of their story and personality
 
The two fall in love about a year after Twilight and Rainbow marry. Starlight begins travelling with Trixie to spend time exploring Equestria. She and Trixie stumble very blindly into their relationship and marry around 3 years after beginning their travels. They settle down, with Trixie working a part-time job in Sugarcube Corner and Starlight working as a teacher.
 
It took them 3 years even after marrying to conceive their first child, no matter how hard they tried. They began looking into adoption, before finally conceiving their son. They excitedly welcomed their son into the word, naming him Hat Trick for the three years they tried to have a foal.
 
They raised Hat Trick as a single child for 13 years, before conceiving a set of twins. During their pregnancy, Pinkie brought up something she referred to as ‘The System’, which they found more and more interesting as Pinkie explained it. The two got involved, and since then, Trixie has been working much more on and off, and does travelling shows with assistants.
 
Healing Lights and Witch Hazel were born to the surprise of Starlight and Trixie. Healing Lights looked like both parents, but Witch Hazel didn’t. It was unexplained for years, until Trixie found out that she isn’t her mother’s daughter. She found her biological mother: A tawny pegasus.
 
Eventually, the two adopt Eclipse Glow from the System, and pass them off to most people as Trixie’s half brother’s kid who needs to live with them now. Eclipse is a bit odd, but a beloved part of their family.
 
The two are debating on having another foal, but have not decided yet.  
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Starlight Glimmer: Starlight’s hair has been put into a ponytail, and shortened her tail and front mane. She has become an elementary school teacher, and a good one at that. She loves teaching her kiddos science and math especially, and uses the time around kids to note which ones might need the help of the System
 
Trixie Lulamoon: Trixie has brushed her hair over one shoulder, and has cut her hair. She works with Pinkie at Sugarcube Corner sometimes, and other times she tours with System ponies. She spends a lot of time socializing, enjoying the spotlight.
 
Hat Trick: Hat Trick is a prideful pony with a competitive streak a mile wide. He’s a very bombastic stallion, and he is a showboater. He is notably older than his siblings, but he really loves them. He’s a travelling performer, but has a bunch of hidden anxiety regarding his future.
 
Healing Lights: Light is a cheerful and relaxed pony who loves helping. She is a paramedic, and is very swift as a result of it. She rambles often, and accidentally mentions things that are unnerving. She loves tabletop games.
 
Witch Hazel: Haze is very calm and calculated. She’s very reserved, and rarely speaks. When she does, however, her voice holds an aura of power that draws people in. She is the apprentice of Witching Hour, and she does most of the sales of general use potions in town.
 
Eclipse Glow: Glow is a very silent pony. People are very nervous around them naturally, and they’re fairly quiet about life because of it. They work in magic studies, mostly as a test subject. They don’t worry too much about it though, since they think it’s fairly safe.