Regarding the father... there is more information in the Reichsanzeiger... I do not know if this is going to work: https://digi.bib.uni-mannheim.de/periodika/reichsanzeiger/ausgaben/1942/5/114
if you press on the left upper button"show issue 114", on the right hand side in the upper the complete official notice is :
"14. Adolf Heikorn, geb. am 7. 9. 1880 in Proßnitz, Wilma Heikorn, geb. Goldschmidt, geb. am 18.2.1888 in Vilsko, Friedrich Heikorn, geb. am 29.3. 1915 in Olmütz, zuletzt wohnhaft gewesen in Olmütz."
So father Adolf Heikorn, born 7 Sept 1880 in Proßnitz and mother Wilma Goldschmidt, born 18 Feb 1888 in Vilsko
Hope you can get to the picture with above discription.
This note in the paper is the official statement, that they loose their nationality and their property.
one last note: the source in the Arolson archive "Source:
Reichsanzeiger, May 18, 1942, -14" has a slight mistake (as they describe below . it is correctly
Source: Reichsanzeiger, May 18, 1942, 114