The only shared resource is a whiteboard on the fridge. It has immediate lists (ie: Phoned 3 plumbers, these are quotes for work to be done and phone number.) and immediate purchase lists (milk, eggs, prescriptions) and immediate ToDos (call Aunt Tracey re:insider trading).

Small whiteboard means it gets cleared and refreshed frequently.

I schedule myself a week at a time, and she prefers a month at a time. So before I schedule anything I speak with her. My family now contacts her to plan holidays however.