Simple app for sharing basic info with caregiver

by Gerry
(southeast Michigan)

We have provided my 93 year old father, who lives 600 miles away, with a live-in caregiver (since he has dementia and is now fairly feeble).

I would like to have a daily log of important matters: if anyone visited, if he had a bad night's sleep, doctors visits, etc.

Can anyone recommend a simple Android phone app, that both the caregiver and I can access, that can be used to record this information?

I looked at journaling apps, but none jumped out as being the right thing.

Possibly a calendar app would work, but I have not explored those fully.

Thanks.