Does anyone know what happened to his widow Johanna Loisinger or their children Arsen (1890-1965) and Zvetana (1893-1935 )? Did they maintain much contact with their Hesse/Greek/Mountbatten relations? I can't imagine they were discriminated against given 1) how much Sandro was loved and 2) the fact that the family was a morganatic branch themselves.
As far as I know, Sandro never saw his mother Julie again after his marriage to Johanna. But that wouldn't necessarily mean that they didn't write to eachother. But I don't know about that. One documented date: August 1908, Assen is visiting his aunt Marie in Schönberg.
Johanna von Hartenau is burried in Graz. As well as Zwetana who died 1935. (cause of death?)
Between WW I & II, Assen was working diplomaticly. But where and what exactly (Diplomat/Secretary?) I don't know.
After WWII he belonged to the finance ministry/office in Wien. He died 1965 .
Johanna evolved into a highly recognised pianist, working with Bruckner and Mahler and others in Wien and in Graz. In WW I it is said that she did charity work.
In 1895 Johanna visited Queen Victoria in Nice (QV being there on vacation). QV wrote:
"Yesterday poor dear Sandro's widow came to see me. Ludwig brought her; & I was so pleased with & touched by her. She is so handsome, so pleasing & so very distinguée. But she looks so sad. She was very much upset at seeing me. " ( I guess that means that Johanna was crying?!)