Something I think needs to be done in the Sims 4

In the sims 4 I hate that when someone in your household/family moves out, you can no longer see when there birthday is on the calendar. As an example, I had a household with the parents and triplets. When the triplets became young adults they all got their own houses. When I switched control to one of the triplets and opened the calendar, I didn't see the other triplets birthdays or the parents birthdays. Is there a way to see it that I just don't know about or is this an issue for anyone else?