Sand (2000)

When Ty's mother dies, he leaves Barstow for the coast, where his mother grew up and where the beach gives him solace. He gets work, makes friends with some local guys, and falls for Sandy, the sister of one of them. Without warning, Ty's hard-edged father, his profane uncle, and his two low-life half-brothers show up, needing a place to hide from the cops for awhile. Ty wants them gone, but his stubborn and ornery family checks into the local motel. Things get worse when the low-life brothers sexually assault Sandy. Her brother and his pals reply with fists. Out come guns and knives, and a showdown in the sand is guaranteed.