Little Miss Sunshine
In Little Miss Sunshine, I think the journey included the entire family, though there are certain characters who this perhaps applies to more than others. More specifically, I think Dwayne, Sheryl, and Frank found the journey to be more personally changing than the others. These characters were the most affected by the activities that occured throughout the trip, and I think the journey brought these three together more than the rest. For instance, when Dwayne learns from Frank that he will be unable to fly and he forces himself to break his vow of silence in order to express the rage and disappointment that he feels and had felt inside for so long. In this Dwayne has to force himself to tell everyone what he really thinks and feels, and does so in a way that sacrifices what he knew to be replaced by who he really is. It's a journey for Frank because he learns that he perhaps hasn't lost it all, like he originally thought, and that maybe this family can offer him more fulfillment to his life- something for him to care about, and something that could bring him some form of feeling wanted or cared for. Towards the end of the film, when Olive is in the pageant, Sheryl begins to become a mother. Before, she had just been acting the part, but in the scene where Dwayne and Frank attemp to get Olive out of the competition in order to protect her, Sheryl reacts in a way that she wouldn't have done before, which propels her out of the stupor she was in and into active role as a mother.
So while it could be said that this was a journey for the entire family, it could be argued that certain characters were more changed than others.