§ 30 Subsequent immigration of spouses
(1) A foreigner’s spouse shall be granted a residence permit if
1. both spouses are at least 18 years of age,
2. the spouse is able to communicate in the German language on a basic level at least and
3. the foreigner … possesses an EU Blue Card.
Sentence 1, nos. 1 and 2 shall have no bearing on issuance of the residence permit where … the foreigner is in possession of an EU Blue Card …