Not a mother and daughter. Both of these women are college-aged friends.
http://thumbs3.oneclickchicks.com/9/2/6/1/5/3162524.jpg
That's from the German nudist documentary
Die Nackte Freiheit which aired on German TV, I believe. If you search for the title, you can find a copy and download it. It is well worth downloading.
There is a copy on a file host not allowed here. So I can't give you a link.
If you want a REAL mother and daughter nude beach video, search Yahoo for "Jack127.wmv". A preview is linked to below. I can't post the link to the video here because that file host is not allowed on OCC. You search for it, you'll find it.
http://s4.depic.me/00187/dehdpgrkm50o.jpg