I do have a mlp next gen of my own but it’s pretty old, so I’m trying to revamp it.(I haven’t done Apple bloom’s next gen yet, sorry!).  
I’ll start with fluttershy’s and big mac’s next gen.The eldest of their two daughters name is honey crisp (the one on the right) and with the youngest being maple (the one on the left). The two daughters though having very different appearances get along surprisingly well.The four of them are a happy little group and live near the edge of the farm and the forest.  
Now to rarity. Rarity originally fell in love with fancy pants and had Daimeon glitz together. Rarity though soon grew tired of fancy pants and left him for Apple jack. She’s much happier now with applejack, her daughter and the triplets. The triplets names are Nina smalls( top left), bebe chi(bottom left) and raja del rio (bottom right). Props to those who get the reference. The triplets specialise in make up and fashion, a lot like Rarity. The triplets older sister’s name is Lady smith the 2nd, named after Granny Smith because of her green coat. Being older than her brothers and cousins, she’s next in line to inherit the farm.  
That’s all I got so far, I’ll do proper bios when I get free time. Base by  
I do not own Fancy pants, Rarity, Fluttershy, Applejack and Bigmac. They belong to Hasbro.