Felix Bolthorn Greengrass (nasc. 15 de outubro de 1977) was the brother of Asteria Malfoy and the late Daphne Greengrass.
When was Felix's nephew, Scorpius Malfoy, was young, Felix fed him boiled skualit. Skualit was a magical rodent that, when cooked and consumed, was drug-like. Consumption of skualit was banned by the Ministry because the consumers and those around them were often hurt. When Asteria found out, she supposedly disowned Felix and never forgave him.
In 2013, Felix was sent to Azkaban for murdering a man while trying to sell unidentified product in the black market. His nephew, Scorpius Malfoy, was forbidden to speak of him.