I’ve been working on this for a couple days. It would have been up yesterday but I came up with Prince Siempre and he took priority.
 
SOOOOOOOOOO Here we go:  
My idea with these two is that they grew apart. I always saw Silver Spoon as more of a crowd follower and when she got older she got sick of Diamond Tiaras shit and stood up for herself and apologized to the CMC crew and made amends. As an adult, she volunteers at the camp from time to time and makes donations to keep the camp running.  
She has a son with Rumble named Silver Lining.  
He’s extremely shy and tends to stay quiet. He only talks when hes very comfortable with his surroundings and the people occupying them.  
Diamond Tiara is still full of herself. Shes pretty miserable with her life but shes too stubborn to let anybody know that, and takes it out on her son, Platinum Parallax. She belittles him for not having a cutie mark yet and refuses to let him associate with anyone who attends the camp or is friends with Silver Spoon. Parallax is very well behaved and mannerly, as well as kind, but because of how strict his mother is, he sneaks off behind her back often. Usually to play with his friends that she doesn’t approve of. Thankfully Diamond Tiara only has partial custody of him.  
His father is a canon pony, shouldn’t be hard to guess who.
 
Headcanons go