Hi!
Read as much as you can here. You'll get a lot of great info. You didn't say how old your Yorkie or kids are, but they all need to be aware of how fragile these fierce, don't know how little they are dog is.
If it's a puppy, be sure to allow down time when he can rest and nap. With 4 kids there will be a lot of playing going on and sometimes they don't realize they are tired. Also have some Nutrical available. If he's play a lot with your kids and doesn't stop to eat, hypoglycemia can be an issue.
Good luck, come here as often as you need, read and ask questions and everything should be fine. Oh, and post pictures after you get him.
