For sure, Mordred had long forgotten her own birth date. With all the wars and pressures she had to face back then, such trivial thing as a birthday had no room in her mind. She did not even checked the date of when she started the rebellion in Camelot or the day she died.
Because of it, she had absolutely no idea whatsoever when she found a well-tied box lying around her bed. She had tried to fight the urge to open it, thinking that it belonged to someone else, but soon she found herself untying the red ribbon and opening the lid to reveal two carp-shaped miniature flags on a stand: one black and the other blue. A card was also neatly placed inside. It read, 'Happy Belated Birthday and Happy Children's Day.'
Before she could determine whether or not it was hers, she saw Emiya Shirou passing her room with a pile of laundry on his hands. "Hey," she called him. "Do you have any idea whose gift is this?"
The redhead simply peeked through the shoji door. "Oh! A koinobori! She got you a present!" he exclaimed and immediately left.
Stunned, Mordred looked back at the figures inside the box. She carefully picked it up, eyeing the carp patterns and blew it, sending both fishes to turn on their pole. A huge grin then creeped to her lips like an idiot.
So Father remembered… and the very thought itself warmed her heart.