From top left to bottom right : Wittgenstein’s sisters Gretl, Helene and Hermine, and Ludwig Wiitgenstein.
<bdi><a href="https://en.wikipedia.org/wiki/en:Moritz_N%C3%A4hr" class="extiw" title="w:en:Moritz Nähr"><span title="Austrian photographer (1859-1945)">Moritz Nähr</span></a>
</bdi>
between 1920 and 1928 <div style="display: none;">date QS:P,+1920-00-00T00:00:00Z/8,P1319,+1920-00-00T00:00:00Z/9,P1326,+1928-00-00T00:00:00Z/9</div>
<a rel="nofollow" class="external autonumber" href="https://www.degruyter.com/document/doi/10.1515/9783839448465-006/html">[1]</a>