No. Possums are marsupials, and not even placental mammals like raccoons and rats. Raccoons are not in the rat family, which is of the order rodentia. Raccoons belong to the family known as carnivora.
It's a canid, so it's part of the dog family. It's part of the same family with wolves, foxes, coyotes, jackals, and domestic dogs. Also, it's called "raccoon dog" because of it's resemblance to the...