That was my first thought upon seeing this Berlin glass paste (it has one more illustrated friend in the same collection).
BUT then I remembered this passage of Hyginus’ Fabulae
Cleops and Bitias (Kleobis and Biton) are here co-opted as symbols of filial piety on par or even exceeding the Aeneas and the Catana brothers.
Liv Mariah Yarrow 
RE: “Did Romans love Herodotus?”
Dear Professor Yarrow,
Thanks for your blog, oodles of brain noodles.
I found it while searching for more information about Hyginus, and was delighted to find the “Berlin glass paste” showing Kleobis and Biton (as well as the “Catana Boys”, about whom I was dismally ignorant).
Could you please tell me more about the showing Kleobis and Biton piece and the source of your photo?
Since I am in Berlin, perhaps I could track it down and get a better photo. If it is still there.
Greetings, David John
email: my.favourite.planet@gmail.com