A take on the sons and daughters of the Mane Six. (A very early work)
 
Their dads are a mystery to avoid shipping wars, so these kids are shipping-neutral. The designs were inspired by the mothers only.
 
Fully detailed personality profiles of these can be seen in the original source link.
 
NOTE: Some of these designs have changed over time, such as hair styles and cutie marks. Also, the breaking the 4th wall joke only works with Deviantart’s green background.
 
Tempest: RD’s son  
Radiance: Rarity’s daughter  
Bismarck, Bucky: Applejack’s boys  
Flora, Peach Cobbler: Fluttershy’s girls  
Berry/Cherry Pie: Pinkie’s twin son and daughter  
Orion, Andromeda: Twilight Sparkle’s son and daughter