Family patriarch erivan haub died in march at his home in wyoming.
Tengelmann's main businesses are the hardware store obi and clothing retailer kik.
He was managing director and part owner of tengelmann.
Haub went missing while skiing in the swiss alps in 2018, and in may 2021, he was formally.
His family say they have given up hope of seeing him alive.
A billionaire long believed to have died in a skiing accident may actually be alive and living with a younger woman in moscow, new evidence has suggested.