In episode two of "The Last of Us," Tess uses the last moments before she turns to command Joel to bring Ellie to Bill and Frank's, saying that they'll "handle it from here." Joel insists that the couple won't take Ellie into their custody nor get her to the Fireflies — which, from all that we learn about Bill in episode three, seems true. In the game, Tess instructs Joel to bring Ellie to his brother Tommy, reasoning that he'll know where Ellie needs to go.
To be fair to Tess, at this point she knew that she was moments away from death and likely wasn't thinking too clearly. But it's a bit of an odd change from the game that seems primarily designed to set up episode three, which focuses on Bill and Frank's relationship.