The Partridge Family? Not. The Jackson Five? Please. But cross Selena with the Brady Bunch and you'd be pretty damn close. Mariachi Vasquez is a certified mom-and-dad-and-all-the-kiddies mariachi group: Daddy plays bass, Mama sings tenor, and the three sisters and two brothers join right in there. The group, which hails from Tucson, has been shaking its maracas since the kids wore Pampers. While other children scribbled multiplication tables, these youngsters perfected their chops on violin, trumpet and guitar. Last year the group cut its first CD, Como la Ves, and is compiling its second. Mariachis usually are content to cover the classics, but Mariachi Vasquez spices its playlist with original material and south-of-the-border tributes to Patsy Cline and Elvis. Although the Vasquez kids are still learning their way around a recording studio -- let them make it through puberty first -- they can still put a little rumba into a conga line. And the Mr. Microphone tribute to the King -- as sung by ten-year-old Vincente -- is enough to put a swivel in your hips. If not a black-velvet Elvis painting in your living room.