When they checked, where he was living, they were assured by Felix Rosier, Darren's son, that Orion Rosier-Black would be fine, because after Evan’s death, the Rosier family turned against Voldemort and helped the Malfoy family to sell some of the more radical death eaters out. Afterwards they abandoned the dark fraction and turned to vote for the neutral section, where they were voting since the fall of Voldemort.