I’m not sure about your household, but often over my way messages are forgotten or more likely not written down correctly, no blame at all meant here!
The solution to those issues seems to be the Discovery Message Magnet Set from the Discovery Store Shop.
Create quick messages for up to six family members and there is a photo slot fo each of the six options. Messages can be up to 10 seconds long which can involve picking someone up from school, getting milk on the way home, or recording your favourite TV show. How did we ever live without one.
Cost is US$19.95 from the Discovery Store website. You may need a re-shipper as they are not yet shipping direct to Australia.