Baukindergeld - Family Constellation

Irrelevant. see above. The applicant must be the owner and that applies here. The children living with them do not have to be the applicant’s.

She cannot be the applicant because she is not listed in the land register and he can submit the application, but they are not his children.

If it were as you say, subsidy fraud would be wide open, because then I could theoretically register my cousin with her 3 children with me, same last name, tax declaration does not have to be done jointly, etc. Although you are instructed to report any changes in circumstances immediately (the cousin would report again after 1 week), hardly anyone would do that for the money. The case is purely hypothetical

The original poster would be on the safe side if he called the KfW tomorrow, inquired, and gave some information here about what it is actually like.

I understand what you are writing. In my opinion, however, it is not correct. I have provided evidence. So far, all I get from you is "that can't be." Hmm.

I would therefore also be very interested in the result of a call