Who: Evan and Ewan Rosier; Gwyneth Cadwallader (or whatever her married name is?) and her family.
When: Late evening, September 7th 1979
Where: Gwyneth and family's house.
What: Scare tactics. That means murder. Also, Ewan proves he's the twin with a soul.
Warnings: Blood and gore. Evan doesn't cast nice spells.
( He hated Voldemort for giving them this order, he hated the other Death Eaters for going along with things like this, and he hated himself for being too weak to stand up and say no. )