No one knew Draco Malfoy had a 2 year old son, not his friends, not the professors. Until little Scorpius Malfoy was dropped off by his grandma and grandpa(Draco’s parents) on hogwarts grounds. Scorpius mother left the picture right when scorp was born. Leaving her son and a note on the Malfoy door steps that simply wrote ‘it’s yours’.