Shared Calendar in iCal

Hi. I have several shared calendars in my Apple Calendar App with my brother. That way, when something important is coming up, such as a doctors appointment or it’s time to pay my quarterly taxes, my brother will get a notification and contact me to remind me. The problem is, not only does he get notifications before the event is to occur, which is what I want, but he also gets notifications every time I add something to our shared calendar. Is there any way to disable my brother getting notifications when I add things to our shared calendar? In other words I want him to get notifications when the calendar events are coming due, but I don’t want him to get notifications every time I add something to our shared calendars. Any thoughts would be appreciated. Thank you in advance.