It was in the first episode of Modern Family in 2009 that gay couple Cam and Mitch introduced their adopted baby, Lily, to the world.
Since then, the couple - played by Jesse Tyler Ferguson and Eric Stonestreet - has been an integral part of the comedy's Emmy-winning formula.
Other US networks have taken notice.
This fall, Justin Bartha and Andrew Rannells star as a gay couple having a baby with the help of a surrogate mother in the NBC comedy The New Normal. And over at CBS, Michael Urie and Brandon Routh play a couple in the sitcom Partners.