They’re wives  
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Ex-Queen Luna  
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Luna stepped down from the throne to make way for her nephew, Harvest Moon, after it was discovered the Sparkle twins held the powers to set the moon and sun. She currently acts as a diplomat, and caretaker for her youngest nephew, Prince Apollo. She’s currently married to Rainbow Dash, and has four children with her.  
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Full Name: Luna of the Setting Moon  
Nicknames: Luna  
Age: Unknown  
Pronouns: she/her, they/them  
Place of Birth: Ancient Canterlot  
Species: Former Unicorn turned Alicorn  
Birthday: December 21st  
Currently residing in: Canterlot Castle  
Occupation: Caretaker to Prince Apollo  
Children: Sundog (step-daughter), Night Owl (oldest biological daughter), Prisma Gaedi (middle son), Iridessa (youngest daughter)  
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Rainbow Dash  
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Rainbow Dash retired from the Wonderbolt force, and currently acts as somewhat of a mascot. She lives at the castle with Luna, and acts as the cool aunt to Prince Apollo. She was married to Night Glider, but due to creative differences, and just being too young to handle the responsibilities, they had to split. They had one daughter together. Dash and Luna actually did not get married until Luna was pregnant with their third child, which was ten years after Night Glider and she had split. She’s currently married to Luna, and has four children with her.  
Full Name: Rainbow Dash  
Nicknames: Dash  
Age: 43 years old  
Pronouns: she/her  
Place of Birth: Cloudsdale  
Species: Pegasus  
Birthday: July 10th  
Currently residing in: Canterlot Castle  
Occupation: Retired Head Wonderbolt  
Children: Sundog (oldest daughter from previous marriage), Night Owl (second oldest daughter), Prisma Gaedi (middle son), Iridessa (youngest daughter)  
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BASE:  
Rainbow Dash - Leiloaf  
Luna - traced from Nightmare Moon screenshot (The Cutie Re-Mark part 2)