LIDO, Venice, Italy – Bradley Cooper’s “Maestro’ looks at the legendary gay Jewish conductor-composer’s life as husband and father.

Cooper,48, not only stars as the magnetic, talented and driven Leonard opposite Carey Mulligan’s loyal wife Felicia, he produced, directed and co-wrote this epically scaled, decades-spanning biopic.

Bernstein’s meteoric rise to fame coincides with his decision to marry the Costa Rica-born Felicia Montealegre. If unconventional partners, they are traditional parents with their three children.

Last summer when first photos from the film were released – and before anyone had seen the movie – Cooper’s use of a prosthetic nose trended on social media. Some branded it as “Jewface,” negatively stereotyping the “West Side Story” composer.

Bernstein’s children – Jamie, Nina and Alexander – immediately defended Cooper, as did the Anti-Defamation League.

Jamie Bernstein, has been especially supportive of this project that years ago had Martin Scorsese as director (he opted out to do “The Irishman”) with Steven Spielberg as producer and possible director.

“My brother Alexander and sister Nina were overwhelmed by the degree Bradley was telling an authentic story about our parents,” she said. “He chose to involve us all through the process. We were part of his bringing this work of art to life. It was touching to us, his desire to tell this story as authentically as he could.

“The generosity went in both directions and we were so honored by it. When he first saw our family home in Connecticut and he said, ‘Could I film here?’ that also was touching – and a surreal experience.”

As Cooper and crew used this real location, the Bernsteins were there often. “The one part we did not see at all was filming,” she said. “Because he keeps a very private set.”

Bernstein, 71, doesn’t see “Maestro” as a traditional biopic. “The whole project began many years ago with the idea of a more straightforward biopic. But Bradley came up with a different idea. He changed the concept for it to be more about this love story, a portrait of a marriage about both of our parents.

“That is always a good story,” she said.  “Because it’s about love and both of our parents were about sharing their love.”

Of course, the Bernstein marriage is so interesting – and why it’s the film’s focus with Mulligan getting top billing — in its matter of fact acknowledgement that Lenny was gay which Felicia acknowledged from the start.

Felicia, a first-rate actor and remarkable beauty, starred on Broadway and live television in the early ‘50s.  The Bernstein artistic milieu was one where everyone essentially accepts everyone’s differences.  It was a cosmopolitan mix that “Maestro” celebrates.

“Maestro” opens Friday