Fans may recall Caleb's appearance in the Season 7 episode " For the Community," in which he played Tone Lane—a "Deputy for a Day."
In the episode, Erin ( Bridget Moynahan) and Anthony tried to prevent the deportation of a prominent community activist, Coryna Garza (Judy Reyes), who wasn't a citizen, and Frank had to decide if the NYPD would participate in the U.S. Marshals' high-profile raid of a local gang.
STREAM: Caleb McLaughlin In "For The Community" (Episode 5, Season 7) On CBS All Access
Sadie's Blue Bloods appearance was a little earlier in the series, during Season 4's " Insult to Injury."
Here, Frank accompanied his grandson, Sean, on a class field trip and struggled to get the lead chaperone to loosen the reigns so the kids could have fun. Sadie portrayed Sean's friend Daisy, who aspires to be a park ranger!
STREAM: Sadie Sink In "Insult to Injury" (Episode 16, Season 4) On CBS All Access
And that's where you've seen Caleb and Sadie before!
STREAM: Full Episodes Of Blue Bloods On CBS All Access
Watch all-new episodes of Blue Bloods on Fridays at 10/9c on CBS and CBS All Access.