What is the name of the twin babies' mother in Rugrats?

The twin babies’ mother in Rugrats is Betty DeVille.

Elizabeth “Betty” DeVille is the mother of fraternal twins Phil and Lil DeVille. She lives next door to Tommy Pickles with her husband, Howard DeVille, and is one of the show’s recurring adult characters.

Betty is portrayed as energetic, athletic, outspoken, and strongly feminist. Her personality is deliberately boisterous, while Howard is generally quieter and more mild-mannered. The contrast gives the DeVille household a distinctive dynamic alongside the twins’ mischievous love of dirt, bugs, and unconventional games.

Betty is voiced by Kath Soucie in the original Rugrats era, who also voices both Phil and Lil. In the 2021 reboot, Betty’s characterization and family circumstances were updated: she is portrayed as a lesbian single mother. Those reboot details do not change the original-series answer.