This is a story about how Woody Harrelson is a jerk, but everyone else is too, and they punch him. This is supposed to elicit sympathy from the audience. When his father dies, he reaches out to ex-wife Laura Dern, because hey, you know, sympathy sex. He discovers that when she had left him, had an abortion and gone into a drug-fueled spiral, she hadn't had an abortion, but had given out the kid for adoption. They track her down, stalk her a bit in a non-threatening manner, and deal with people being jerks and punching Woody Harrelson. Eventually, Dern moves to Australia, Harrelson shacks up with a young, beautiful woman and things turn out well for him, despite the fact that he is still a jerk -- he just doesn't punch anyone. By the standards of this particular Cinematic Universe, this makes him a Good Person Who Deserves All Good Things & Gets Them.
In short, this is a bad movie with good performances. There are quirky individuals and snide commentary about how people are jerks, but nothing changes, and you are left with numerous questions about what is going on. How does Wilson live? Why can he take off to go stalk various relatives without worrying about money? Aren't there any adults anywhere? If it weren't for Harrelson's straightforward, oblivious idiocy, this would be unwatchable.