Hello!! I am almost positive that is Allison. I’m guessing this is the picture you are referring to:
I’ve seen it floating around for a long time labelled as Robert and Allison, but I’ve also seen it discredited on forums as a fake. There’s another picture that allegedly came from Allison’s facebook page, which seems to fit with the timeline of the two pictures in our earlier post:
It’s hard to be certain of anything since nothing on the internet can really be used as concrete evidence. But based on the tiny bit of information available, and the fact that there is a professional portrait of Robert holding a baby, my best guess is that Allison is in fact younger by quite a few years! Thanks for asking, I hope this helped!
Robert Plant and sister Allison ca. 1959 (left) and 1962
Led Zeppelin, 1972 in the Nassau Coliseum. My dad took this picture on his Polaroid camera and he says they were playing Immigrant song during it.