Silver raindrops, golden clouds

It was an ordinary day in Twilight's castle. As usual, she was spending her afternoon organizing her library. However, she had taken a small break to read a book about the Equestrian royal family. Despite being Celestia's student, she had not as of yet studied her family history. As she flipped through the pages, she could tell by the rich, slightly musty scent that this book had remained hidden in the back of some forgotten bookshelf for a long time before coming to her. As she approached Celestia's generation, she smiled. Until now, she hadn't realized how interesting the Equestrian royal bloodlines were, twisting and branching gracefully like the roots of her old tree home. But when she reached Celestia's point of the page, she paused. Luna was not her only sibling. Besides having her sister, Luna, Celestia had two brothers. Twilight gasped as she read the names. Lord Gold Soul, her niece's owner, and the disgraced King Sombra. She put the book in her saddlebag and flew into the skies, setting her course for Canterlot.

Celestia sipped her tea gently, musing upon her day. She had been through some amusements in the Royal Diurnal Court, settling the fussing and grudges between nobles. Parliament had strongly advised against one of Luna's plans to extend the night by five minutes each cycle, and now here she was, drinking some vanilla camomile tea to soothe her nerves. After all, being a princess was hard work. Luna preferred coffee, but Celestia could never see the appeal in it. It was far too bitter for her tastes. A knock upon her door brushed these thoughts away, however. She opened the door, letting in her most faithful student and now fellow ruler, Twilight Sparkle. She smiled upon her, happy to see her once more.

"Why, if it isn't Twilight Sparkle! How can I help you?"

Twilight blushed and looked away, slightly nervous about her question. Maybe that book had been tucked away in a forgotten corner, shut tight, for a reason. Twilight took a deep breath. "I have something to ask you...

Celestia smiled even wider. "Of course, Twilight. Anything."

Twilight shook a tiny bit, looking at the ground. "Do you.. Have brothers?" She asked.

Celestia's eyes shot open in surprise as she was taken aback. "Well, you see, I... I..." She sighed. "How did you find out?"

Twilight held up her book. "It was in here, Celestia. Please... I need to know." Celestia examined the book.

"Ah, yes, the old genealogical records. I should have guessed you would find them eventually." She said coldly.

"So, it's true?" Twilight asked, shocked.

"Yes, I'm afraid it is. Gold Soul and Sombra are indeed my older brothers."

Twilight looked up at her at last. "Wait... Older brothers? Then why aren't they ruling over Equestria instead?" She asked, puzzled. Celestia sighed, thinking back upon the memories she had held back for so long, and began the tale.