The “Blue Bloods” universe expands this fall when Donnie Wahlberg’s Danny Reagan moves to Boston and encounters another law enforcement family — the Silvers — in “Boston Blue.”

Like the Reagans, the Silvers have a strong tradition in policing, and the two families immediately develop a kinship.

The transition, Wahlberg says, has been seamless. “It became something I couldn’t even dream of,” he says.

For good measure, folks from “Blue Bloods” will make guest appearances throughout the season. Danny’s son, Sean, provides a link between the shows. He gets dad to Boston and, while there, dad learns his son “doesn’t have another Reagan on the job … and that’s never happened in the history of the family. It’s the father-and-son bond” that gets him to stay.

The Silver family, meanwhile, repre

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