The Dalmatian Puppies are the sons and daughters of Pongo and Perdita. They were mentioned in Descendants when Maleficent tells Cruella De Vil that she wants revenge on the dalmatians.

Before Auradon

101 Dalmatians

In the first film, Perdita gives birth to a litter of fifteen puppies who are later kidnapped by two criminals named Jasper and Horace, who were actually hired by Cruella De Vil. While at Hell Hall, the ancestral home of the De Vil family, it turns out that Cruella had also gotten 84 other Dalmatians, but through legitimate means. It later turns out that Cruella wants to kill them and turn them all into dog-skin fur coats. Perdita and her husband, Pongo, rescue the original fifteen, and they decide to adopt the other 84 as their children because they don't want to let them get killed.