The Weasley twins were nothing like their father and mother, with an eye for sneakiness and stealth that the two had used when plotting and carrying out their pranks. (Lucius found out exactly why his heir called them the Terror Twins. They would end up using any available moment to prank the closest person who had their guard down. The Malfoy Lord quickly learned to stay extra vigilant when the two would get that gleam in their eyes.) They were almost as quick to understand the theory of the magicks and the different ways to utilize them as the mudblood.