Possible Clues:

• Half a '60s group
• PTA members
• Half of a 1960's pop quartet
• Half of a '60s singing group
• Half a classic pop group
• Half of the "California dreamers"
• Nursery rocker, often
• With 40-Down, quartet of the '60s
• Biker women
• "___ Family" (Vicki Lawrence sitcom)