9 years, 2 months.
Last week, I was so relieved that the time had finally come to upgrade your sister’s car seat to a booster seat. Granted, we had to order two of them; one for each car.
I was relieved because, in theory, it’s much easier to buckle in a kid in a booster seat as opposed to a car seat.
For you though, you were excited because that meant you to play with two huge boxes until they finally flattened out; largely due to you teaching your sister to be an escape artist, as you closed in the open side with pillows.
I especially liked the work cubicle you made, too!