Tom and mattheo are voldemort's son's. But they have a big sister, Y/N. Y/N is a professor at Hogwarts, where the boys go to school at. Tom in 7th year and mattheo in 6th year.

Tom is always cold, mattheo is the fighter with Y/N the 'mother'. Tom and mattheo have a group of friends. Theo, Enzo, Blaise, Draco, pansy and Regulus. Which they all just hang out in Y/N's classroom.

The boys and their friends we're walking into Y/N's class, per normal.. But they just left a death eater meeting.