Onecalendar in Outlook
I suggest to implement the Ical link in order to shere all the calendars of onecalendar with outlook. I use outlook for job and should be very helpful see all my appointments in the outlook calendar in order to avoid conflict. I can't directly share my calendars to outlook because of the impossibility to share through Ical the family calendar of Google (that it's ridiculous but this it's how it works)