How to be a “Feel Good Movie”, “This Is 40” style:
Create two miserable characters, unhappily married to each other. Show in great detail all the miserable facets of their unhappy relationship… the lack of personal space, the unfulfilled wishes, the financial pressures, the ridiculous demands they place on each other, and then show them argue about these things. At length. Constantly. Then show how miserable that this is making the couple’s children. Then show the irresponsible parents that caused these two to grow up miserably, and how they’re still making the couple miserable. Finally, your audience will be miserable after watching two hours of nonstop arguing and misery and complaining about being miserable.
Then, when the credits roll… it will feel SO good.