As inferred by their name, besides Chip, Mrs. Potts had at least six other children (according to Marvel Comics, including Chip, she had 12 children overall). Like their brother, the children were transformed into a teacup set by the Enchantress.
Beauty and the Beast
They were first alluded to when Mrs. Potts was putting Chip into the cupboard for the night, despite his protests, shortly before Belle entered the kitchen after leaving her room during the first night at the castle. Despite this, however, they were later awake and helping prepare Belle's meal ("Be Our Guest"). They aren't seen again until the climax of the film, where they aided Mrs. Potts in driving out the invading villagers by pouring hot tea onto a bald, mustachioed baker. They aren't seen again for the rest of the film, although they are implied to have regained their human form.
Disney Princess: Princesses and Puppies
It is revealed that Mrs. Potts has a daughter.