A family journal you'd actually hand to the grandchildren.
Journaling apps have a peculiar failure mode: the more meaningful the entries, the more painful it is when the app closes shop.
A family journal is one of the longer-lived documents a household produces. Any container for it should also be long-lived. A file is that.
For milestones, not moods
Kept the way a family keeps a photo album — not the way a mood-tracker keeps a chart. Add the entries that will matter to somebody in fifty years.
Prints as a book
Once a year, print the journal. The physical artefact is the actual heirloom; the file is the working copy.
Also for the harder years
Grief, illness, divorce — the years worth recording, kept in a file no algorithm ever surfaces back to you as a memory.
What to reach for
Common questions
Can multiple family members write?
Yes — the file lives in a shared folder. Sign your entries so the grandchildren can tell you apart.
Prompts?
None — deliberately. Prompts are the app-industry addition; a family journal is a blank page.
What about photos?
Link a filename from the entry. Keep photos in the camera roll where they already are.
Compared to Day One?
Day One is a lovely app. A file is a lovely artefact. Different bets.