In his new film, “The Playroom,” which had its world premiere at the Tribeca Film Festival last week, Academy Award nominee John Hawkes plays Martin Cantwell, a passive father who struggles to keep his dysfunctional family together as ugly truths are revealed over the course of an alcohol-drenched dinner party in 1970s suburbia. The night unfolds through the eyes of his four children, who are sequestered in the attic but sneak downstairs to spy on their parents’ debauchery. “One of the things that attracted me about this script was that it was the kids’ story,” Hawkes says of “The Playroom.” “You don’t see that often. I also was impressed with the fact that the kids were human beings in the script. They were interesting and funny and well-rounded. They’re not the Hollywood version of kids, but just kids.”