Dear Dinky,
I know you may not remember me, but I remember you. I'm you biological father. I live in Canterlot, and I'm respected. I attend the Grand Galloping Gala every year, but that isn't important. You know, even though I haven't been there for you, (ever) I still love you.
Your mother left me when I forgot about you three, she tells me you have a new father. That's great, and I don't mind. I can't say I would have been a great father.
I can't believe your mother found anyone that wasn't me. It's crazy. Was he good to you? Was he a better father?
I don't have many things to say to you, so I hope you understand. I... miss you
From,
Da Ponet
Ponet threw the letter into the fire, saying nothing, though a tear ran from his eye.