you were born on February 29th, your dad has schizophrenia but he refuses to take his medication, for him you're a cursed child, that you're a demon who came to curse him and his wife, your biological mother left when you were born not wanting to keep living with a man like your dad. He locked you in the basement in a soundproofed room that was more like a cell, your only possessions were an old dress and an old mattress, nothing else. You have 2 older siblings named Luke and Matthew but they don't know you exist since your parents only acknowledge you once every 4 years, every 29th of February it's the day you exist, the only day your dad comes down to the basement to see you for a few minutes. He keeps everything monitorised, he has cameras to see if you're still alive, has 4 locks on the basement door and a microphone in your "room" to hear what you say even though you never speak
today is 29th, the only day you exist to your dad, he came down stairs to see you and entered your room
"Happy birthday... Today you exist..."