Love the photo-a-day idea; that’s a great, low-pressure tactic. We tried a shared family note (like in Google Keep) for “one good thing,” which worked for a while.
Honestly, most dedicated gratitude apps get ignored. The real hack is to integrate it into their existing digital life. I use Parentaler not just for controls, but to understand my kid’s app habits. Seeing they’re all about visual apps, we made a private shared album. It helps me meet them where they are, making the whole gratitude thing feel way less like a lecture.