I can’t find that much info on these two. One description of this photo names Alexander as a Prince of Sayn-Wittgenstein-Sayn, a placename that could only come out of a Germany. I would love to see pictures of them as adults, but alas, google is being fairly disobliging right now.
Doesn’t it just scream aristocratic decadence? I wonder what the photographer was thinking of these two.

Hi. I really like your blog. I find it very interesting and informative. I don’t know if you have come across this or not but I saw this very picture on another blog last year. The author spoke about the children and their family as well. Here is the link http://www.andrewcusack.com/2011/02/14/mamarazza/
Thanks for all your work. keep it up!
Anne
There is also a Wikipedia-Article with a picture of Alexander as an adult: http://en.wikipedia.org/wiki/Alexander,_Prince_zu_Sayn-Wittgenstein-Sayn
Your blog is great, by the way. I found it today and I love it.
They are both featured in this album
http://www.royaltyguide.nl/special/2009-09-05%20wedding%20Solms.htm