Notifications (task assignments, reminders, follow-ups, the daily briefing) go to each person's Notify email unless their channel is SMS or Off.
Google Calendar ID: Google Calendar → Settings → the calendar → “Integrate calendar” → Calendar ID (looks like …@group.calendar.google.com). Use primary for your own main calendar. Leave blank for people who should not receive calendar events.
From name / address override the household sender for emails to that person only; the address must be on a domain verified in Resend. Replies always go to Chris.