Eulogy (2005)

Kate is screwed up, a loner, unpopular at college, but ironically the most normal one in her entire family. When her beloved grandfather, the Collins Family patriarch, dies, she and her dysfunctional family converge at Grandma's for the funeral. They have always hated each other and in this confined space it's not surprising that an all out war erupts. Meanwhile, Kate is attempting to write the eulogy for Grandpa, discover the real identity of her long-lost mother, and lose her virginity to Ryan, her childhood friend - all unsuccessfully.

Official website: http://www.eulogythemovie.com/