So to summarize: Nick’s great-grandmother had it. His grandfather had it. And both Marie and Kelly had it but not their brother. Women become aware sooner than men, but nobody knows why or how it’s passed, just that it’s inherited.

I think this still tracks with what we previously theorized around Grimm traits being sex-linked in some way.

I can’t stress enough how good season one of Grimm is. The plot twists are INSANE but also don’t come out of nowhere. Everything builds in small pieces over the course of the season and culminates SO perfectly in the finale, while still leaving so many questions open for the story to continue.