classic rock stars

What do Elton John, Grace Slick, Eric Clapton, Frank Zappa and David Crosby have in common? They were all photographed, at home with their parents (though in Clapton's case, grandmother), for the September 24, 1971 issue of LIFE Magazine.
Grace Slick, pictured with her daughter, China, and mother, Virginia Wing Slick revealed to the Wall Street Journal that