If this was the third time this week i would simply ask on the situation as an why they have been picked up late because things happen and its not people fault all the time, but it does affect the timing when being picked up if the center closes a certain time. After i would try to make plan and slove the situation.

I would welcome the child by making them introduce themselves as well as making posters of different cultures around the world and making sure they know it’s a safe place to be welcomed. I would also make the other kids learn some words as well to communicate with the child.