Cui Yan
Cui Dan had at least seven brothers — older brothers Cui Bin (), Cui Feng (), Cui Yan (), Cui Xun (), Cui Han (), and Cui Shan (), and younger brother Cui Fu (). Among the brothers, Cui Bin was the most well-known and one whose acts were most well-recorded in the official histories "Old Book of Tang" and "New Book of Tang". Six of the brothers would eventually reach high level positions within the Tang government.