Everyone In My Family Has Killed Someone

Everyone in my family is a killer. Everyone in my family is a suspect. But which of them is a murderer? I knew our family reunion wouldn't end well. But I didn't expect murder. Maybe I should have known better. After all, everyone in my family is a killer. My parents, my siblings, my in-laws.... even me. The deaths weren't all deliberate, of course. Accidents happen. So when a body is found in the snow, it's clear it's the work of a Cunningham. But which one? And why? I'll give you one clue: it wasn't me. But a piece of advice? Never trust a Cunningham