It has been stated that Pearl has four children: Jerry, Wilma and two twin sisters.
In the first few seasons of The Flintstones, Wilma's maiden name was said to be "Pebbles." How Pearl was a Slaghoople, and yet Wilma's maiden name was Pebbles, was never explained. Possibilities include Pearl divorcing Wilma's father, Mr. Pebbles, and later marrying a Mr. Slaghoople, Pearl herself was using her maiden name, Wilma was using her middle name (on account that "Pebbles" is easier to say), or that Hanna-Barbera purposefully changed it to avoid confusion with Pebbles Flintstone. Another possibility is that Peal Slaghoople merely kept her maiden name upon marriage. This makes sense as she did represent a person of strong feminine qualities. More logicaly is that Pearl married Mr. Slaghoople after being widowed by Mr. Pebbles (it is stated that Wilma's father has passed way) and he adpoted her daughter, Wilma. Hanna-Barbera, however, merely attributes the discrepancy to a continuity error. Later spinoffs would retroactively assign Wilma's maiden name as "Slaghoople."