Mika Amonsen will replace Andrew Terraciano, who played Sean Reagan throughout the 14-season run of "Blue Bloods." ...

Danny Reagan’s youngest son Sean will look a little different when he appears alongside his dad on CBS’ upcoming drama series ...

Mika Amonsen ( Thanksgiving) has joined the show’s cast as Sean Reagan, the youngest son of series lead Donnie Wahlberg’s ...

CBS’ upcoming Blue Bloods offshoot has added another Reagan - though he will look a bit different when he shows up. A ...

Danny Reagan will be bringing a Blue Bloods family member with him to Boston Blue - but they’ll look very different to ...

Although “Boston Blue” is a direct offshoot of “Blue Bloods,” the Reagan family will look a bit different this time around.

Throughout the 14 seasons of 'Blue Bloods,' through the series finale, the character was played by Andrew Terraciano.

Boston Blue, the Blue Bloods spinoff, recast Sean Reagan, Danny Reagan's son, with Mika Amonsen replacing Andrew Terraciano in a shocking twist ...

CBS' spinoff of 'Blue Bloods' titled 'Boston Blue' comes after the original show's fourteenth and final season ...

Blue Bloods wrapped its final season almost seven months ago, but there's a fresh chapter about to begin. Wahlberg revealed ...

Check out Wahlberg’s Instagram story above and stay tuned to Collider for more about Boston Blue.

Danny Reagan might want to clear a guest room on Boston Blue for his Blue Bloods family. This fall, Donnie Wahlberg reprises ...