I just finished watching this wonderful movie and still have tears in my eyes. I LOVE movies like this one and will be watching it again.

The Hoovers are a stressed, dysfunctional family living in Albuquerque, New Mexico. The plotline begins as Sheryl Hoover (Toni Collette) picks up her brother Frank (Steve Carrell) from the hospital after his failed suicide attempt. Sheryl's husband Richard (Greg Kinnear) is a struggling motivational speaker, attempting to market his "Nine Steps to Success" program, and annoying the family with his aggressive Type A personality. The couple has a young daughter, Olive (Abigail Breslin), and Sheryl has a sullen teenaged son, Dwayne (Paul Dano) from a previous relationship. Richard's foul-mouthed father, Edwin (Alan Arkin) also lives with them.
For more on this synopsis (which contains spoilers) see:

Little Miss Sunshine (2006) - Synopsis