To help a loved one with a health app, stay beside them while they do the steps. Let them type in their own password.
Do:
Ask their permission before looking at their data.
Use the sharing features the app provides, when they exist (caregiver access, report sharing).
Let them decide what they keep, share or erase.
Avoid:
Signing in on their behalf, with their username.
Keeping their passwords in your phone.
If the app has no sharing feature: your loved one can export a report as a PDF (in the app’s settings: « Export » or « Share ») and send it to you by email.
Limitation: if your loved one can no longer decide for themselves, a legal document can give you that right. In Quebec, it is the protection mandate: a notary or a lawyer can explain it.
To picture it: helping is holding a hand, not taking a place.