Thanks to some handy security footage, Team Flash discovered that Orlin Dwyer is the only man to visit Grace since she was brought into the hospital, and he just so happens to be her uncle.
At the end of the episode, Sherloque came to the conclusion that just as Team Flash had wanted to be together as a family for Thanksgiving, surely Grace’s protector would want to be with her for Thanksgiving.
At this point, viewers know a lot more about Orlin than Team Flash does, but they are privy to at least a bit more of information about him than they were last week.
The Flash 5x08 Promo "What's Past Is Prologue" (HD) Season 5 Episode 8 Promo - 100th Episode