Detective Joe West is Barry Allen's surrogate father and the father of Iris West. He works for the Central City Police Department.

Detective West is fully aware of Barry's secret identity but asked his stepson to keep Iris in the dark about The Flash for her safety. 

Detective Joe West Quotes

Alright, the only red-suited guy I want in this house right now is Kris Kringle. You got it?

Joe

Barry: I think maybe they got... whammied.
Joe: Did you just say whammy?

The Flash Quotes

One mystery I cannot figure out is why some people come into our lives and why some people go. Others become a part of you. Some friendships feel like they'll last forever and others end far too soon. Not every friendship is meant to last forever. What does last forever is the pain when that person is gone.

Barry

Barry: I love you, Iris.
Iris: Oh. I love you, too.
Barry: When we were kids I loved you before I even know what the word love meant and then my mom died and I had to go live with the girl I had a crush on. Look. There were so many times I wanted to tell you; Jr. Prom, when I went away to college, when I came back from college, nights that we stayed up talking, all the birthdays, all the Christmases, but I, I never did. I kept it in. After I lost my mom and my dad, I was afraid that if you didn't feel the same way, I would lose you, too. That's the irony. I was so scared of losing you that I did. I know I've had our whole lives to tell you this and you're with Eddie now and I know that and I know my timing couldn't be any worse, but I just... I couldn't lie to you anymore. I'm sorry.