Source: See below
Herbert Halsegger sends us this very nice photo of Seigfried Reginald Wolf - who eventually emigrated to Haifa - playing chess with his son, Alfred Emil Wolf (1900-1923).
Tragically, Alfred was killed in a mountaineering accident. He was a promising player in his own right, his obituary appearing in both the chess column of the Illustriertes Wiener Extrablatt (13 August 1923, p. 4) and on the first three and a half pages of the Neue Wiener Schach-Zeitung (vol. 1 no. 6, pp. 161-164), as Mr. Halsegger informs us. The photo is from p. 162 of the latter obituary.