Dear Karin Alex,
Welcome back to the Wefugees Community and thank you for your question.
I remember that I tried to answer this not very easy question here. If you understand German, you may also have a look at this brochure (p. 24), in which the authors explain that family members are in many cases asked to leave the country and the immigration office may unfortunately may not issue a "Duldung", for instance.
However, I will also link my dear colleagues @mbeon-Christine and @mbeon-fardeen here as well. Maybe they can add some information or an advice.
In any case, please don't hesitate to get back to us with any further question.
All the best,