Gabriella is the mother of Samantha. She looks identical to her daughter, just older (in "Mommies Dearest" she originally had brown hair). Gabby loves Sam very much, but she had a tendency to be overprotective of her though (Gabby only has her best safety in mind for her daughter).
In "Totally Busted", she and Clover and Alexandra's mothers, Stella and Carmen, find out that their daugthers are undercover super spies for WOOHP. They make their daughters quit (Gabby feels it is too dangerous for Sam), but are later kidnapped by Mandy, Dominique, and Caitlin at The Groove after they got turned into spy-ssassins because of the SUDS. After their daughters save them, they (Sam, Clover, and Alex) get captured by Mandy, Dominique, and Caitlin. Gabby, Stella, and Carmen turned to Jerry Lewis for help and become spies to save their daughters, and in the end they become official spies for WOOHP (Gabby's Catsuit was jade green).
Sam's father is seen in "The Wedding Crasher".