I have set up a family calendar on my live.com account and then share the calendar with kids to their live.com account.  This account is set up on their iTouch devices so that they can see family calendar. 

The issue is on calendar invitations sent to my account, such as when my husband sends an all day to put travel days on calendar.  These outside invites come to my main account and work fine. 

The issue is that these invites are "forwarding" to the kids accounts.  If look at the detail of the invite on my account and/or my iPhone lists only me as invitee.  If look at the detail in the kids live.com account or iTouch have their account as additional invitee.  The invites will list is open invitation and if select will show standard - maybe, accept, decline but if answer will roll off but within seconds show back on open invite list. 

The shared calendar access is set up with view details only.