Brandon Sonnier knew as he was developing a spinoff of CBS’ popular “ Blue Bloods ” that it was essential to keep the faith.

A devoted viewer of the drama centered on a multigenerational Catholic family of New York policemen, Sonnier was among the legions of fans moved by the show’s signature event — the Reagans’ weekly Sunday dinners. The series starring Tom Selleck was a pillar of the network’s lineup during a 14-year run which ended last year.

“That family dinner is representative of what the show is at its core — a family drama dressed up as a police procedural,” says Sonnier. “It’s a family with strong morals and a sense of duty who all come together each week.”

He and his producing partner Brandon Margolis are continuing that tradition with CBS’ “Boston Blue,” premiering Friday,

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