The family of Frank Sinatra family is said to be worried about the way the late singer will be portrayed in a new biopic by director Martin Scorsese.

The veteran film-maker reportedly wants to focus on the darker side of the crooner’s life.

But his relatives, including his youngest daughter Tina, hope the flick, Sinatra, will concentrate on his musical legacy, rather than his personal life.

“Marty wants it to be hard-hitting and showcase the violent, sexually charged, hard-drinking Frank, but Tina wants to show the softer side of her dad and let the focus be on the music,” said a source.

The insider continued: “The ’60s were a very swinging time for Frank – he was having sex with a garden variety of bimbos and cementing his Rat Pack status.

“It’s a really key time [in] his mythology.”

It was announced earlier this year, in May, that Oscar-winner Scorsese would direct the flick.

Leonardo DiCaprio and Johnny Depp are among those who have been tipped to play the singer, dubbed Ol’ Blue Eyes, who died in 1998 at the age of 82.

A representative for Scorsese said:

“He [Scorsese] and Tina are looking forward to working together in the future.”

A representative for Tina Sinatra was unavailable for comment.