A more sophisticated method is Cozi, a great app with sharing capabilities. it has all kinds of lists in addition to a calendar. It has a handy sharing feature. We use it to input a grocery list as we notice things, then whoever gets groceries has the entire household list. We also keep lists for presents, household tasks, motorhome tasks, etc. Calendar works in a similar manner. You can input individual appointments and only one person gets the alarm, or you can input shared appointments and we both get the alarm. I put birthdays on a repeat with the first alarm 1 week before, the second 3 days before, and the third the day off. My short term memory is shot, and if I don’t get notice of an appointment, it doesn’t happen.