Low-Key Birthday Celebrations
The siblings reportedly enjoyed birthday pancakes together in West Hollywood for their eighth birthday in 2016.

It might be due to having famous parents or simply their preference, but in past years, Knox and Vivienne kept their birthdays low-key, regardless of the reason.
Mini-Entrepreneurs
It was revealed back in January that Knox and Vivienne decided to join their siblings in participating in the traditional activity of selling goods to neighbors and friends.

However, instead of setting up a lemonade stand, the Jolie-Pitt kids set up a stand selling dog treats at their local dog park. Parenthood alum Sarah Ramos shared a picture on her Instagram showing the Jolie-Pitts, including Mama Jolie, trying to sell their goods at a dog park in Los Angeles, providing evidence of the stand.