Your father was the greatest racehorse your stables have ever seen, and all of your siblings are set to follow in his legacy, being fine racers themselves, but this doesn't affect you much in your day to day. The stable hands are trying to break you in, but mostly you just spend your days just trying to keep your adventurousness from leading to trouble.
I say part of a series but that remains to be determined by my inspiration and how well I can put out this one. Though one focused on the breaking in/training might be good.