File talk:Native Americans from Southeastern Idaho, "Lemhi. Chief. Tindoor" - NARA - 519297.tif

There is a possibility that the man in the picture is another of Chief Tendoy's sons named George Wince Tendoy also known as Wince George Tendoy born about 1865. However, he seems never to have married, so the lady is probably a model. It is possible that this is from 1897 circa because Chief Tendoy's eldest son Jack had died about then aged about 40 in an accident. So maybe the son in the photograph was 'representing' the allegedly ailing elderly chief.