This! And the dog is a "fear aggressive" dog and is actually one of the most dangerous because you can never know when and how they will react in situations. Most definitely get to a Dr to be seen and they will know what to do for your particular local laws.
Reporting this is a necessity because unfortunately many kids are not taught proper dog etiquette and a fear biter can, and will, lash out at unpredictable kids in fear.
Best case scenario these are good, but ignorant, dog owners. The dog will be up to date on all shots and they will quarantine. They will also be educated about dog laws and their responsibility as owners and get the proper help for their beloved pet. End of situation. OR, they choose to be ignorant and you've helped a dog get out of a bad situation. Either way, it's a win.
PS, I've worked at vets and attended vet tech school. I've see both types of owners. Most have the best of intentions just lack of education. The other ones are better off without a dog.
Please update with how you and your bites are doing!