VENICE A gentle study of dysfunctional families by veteran American director Jim Jarmusch clinched the top prize at the Venice Film Festival on Sept. 6, while a harrowing docudrama about the Gaza war took second. Jarmusch's "Father Mother Sister Brother" starring Cate Blanchett , Adam Driver and Tom Waits, drew mostly positive reviews for its humorous portrayal of awkwardness and guilt. The "Broken Flowers" director, who wrote the script for three family get-togethers in upstate New York,