I don't know enough about The Flash to know if Iris West had a dad in the comics or not, or if this dad was a cop who assisted Barry Allen, but that's how it has all shaken out for the TV version.
According to The Hollywood Reporter, Law and Order alum Jesse L. Martin will play Detective West on the show. Here's a description of the character as per a casting call:
DETECTIVE WEST – Late 40s to Early 50s – African American -Detective West is an honest, blue-collar cop who's seen it all. A soulful, funny caring father to Iris, and a surrogate father to Barry, West came up through the foster system himself. He took in Barry after his mother's murder and his father's imprisonment. He believes in Barry and supports Barry's efforts to prove his father's innocence.
That was dug up by Bludhaven Banter who also got this description of Iris:
IRIS – 22-28 – African-American – As smart as she is beautiful, Iris is in grad school studying psychology. She's also Barry's mile a minute, fast-talking, quick-witted best friend. Her father, Detective West, took in Barry when his mother was murdered, and his father was wrongly accused and imprisoned for her murder. In a tough childhood for Barry, she was the one "not tough" thing. She's unaware of Barry's strong feelings for her.
So, some things have changed. For the better? Well, not inherently for the worse. We'll have to wait and see the show, if it gets past the pilot stage, to see how it plays out in practice.