Dear @lillyahoo,
Welcome to the Wefugees Community and thank you for reaching out to us.
Did your friend sign a declaration of Commitment for his mother? If he did, he needs to cover all costs that the German state could incur from the visitor in question for up to five years, including:
- Cost of living (food, clothing, etc.)
- Cost of accommodation
- Cost of medical care
- Cost of a possible deportation
Once the visa has been issued, you cannot withdraw your declaration of commitment anymore. Please see Handbook Germany's website for more information (in various languages).
In any case, I recommend your friend to get in touch with a counselling office to discuss the details and potential options for him and his mother (there might be exceptions or hardship regulations I am not aware of). Also don't hesitate to get back to us with any further questions.
All the best,
Meike