BERLIN (AP) -- Demi Moore and Parker Posey play two very different sisters in "Happy Tears," a low-glamor portrait of siblings trying to cope with an ailing father, which premiered Wednesday at the Berlin film festival.

Posey stars as the daydreaming Jayne, who lives a comfortable life with an art dealer; and Moore as no-nonsense Laura, a busy mother of three who has taken the brunt of dealing with a parent slipping into dementia, played by Rip Torn.

"I've always loved Demi's work," director Mitchell Lichtenstein said. "I was just excited about the idea of her playing a kind of normal person ... it was not a high-glamor part."

Moore, 46, told a news conference that "I certainly have things that I can relate to" in her character, which she described as "the overburdened sister, the caretaker."

She said that, in her own life, "always family is first, because that's what you have at the end of your life, and your work is just what you get to do."

Posey said that, like she and her twin brother in real life, the two sisters in the film are "very opposite ... two different sides of the same coin."

In the movie, Moore's character "carries the awareness and I carry the unawareness, and by the end they affect each other," she said.

"Happy Tears" is one of 18 movies competing at the Berlin festival for the top Golden Bear honor, which will be awarded on Saturday.

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Festival site: http://www.berlinale.de/en/HomePage.html