He is, and Clan Leader Lan is enjoying himself teaching painting and xiao at the Arts Center too much to make anyone read foundational texts of the Tao. In fact, with the much-relaxed formality here it is really not necessary to call him Clan Leader Lan at all. Lan Xichen is acceptable, or Shushu, since his brother is married to your martial uncle. (I assume Wei Wuxian has already scolded you for missing the wedding as if it was your choice to do so.)