I did some research for your brother and found a list of therapists in Germany here.
After the first 18 months in Germany, refugees are most of the times entitled to medical care that corresponds to the health care of other legally insured persons. However, this regulation also means that psychotherapy can only be carried out by therapists who are licensed by the health insurance fund.
Since there are too few psychotherapists with a health insurance license to adequately treat the large number of asylum seekers, the so-called Asylum Package I in October 2015 expanded the possibility of authorizing psychotherapists in the licensing regulation for physicians.
On this page you will find a selection of authorized psychotherapists and psychosocial centers who have provided their contact details. If you are looking for psychotherapeutic treatment, you can contact them directly.
In the list you will find phone numbers or e-mail addresses. If your brother needs further help in contacting us, please let us know. We will be happy to try for you if we know in which city or town we should try. Also, has your brother already had the opportunity to learn German?
There are also psychosocial centers. These very often work together with translators. There are 47 psychosocial centers in Germany. Here is a list: https://www.baff-zentren.org/hilfe-vor-ort/psychosoziale-zentren/
I continue to think about it and also like to check again with us in the community if similar questions have already been asked. If you have any questions or need help contacting us we are here for you. We can help you more specifically if we know where to look, but of course we still hope to have helped you already.
I would also like to link our expert @meike here.
With best regards