You are correct Robert but it also leads to an interesting observation:
Chen Zhaopei was a disciple of Chen Fake
Chen Zhaokui was the youngest son of Chen Fake
Substantial variation in what they learned?
Lots of variation even within a line of the Chen taijiquan lineage?
I don't know if this will ever be resolved but I see more similarities than differences but then again I am definitely not an expert on Chen Taijiquan and the lineage.
http://chenfamilytaiji.com/profile_chen_qingzhou.htmlChen Qingzhou is a 19th-generation lineage holder in Chen Family Taijiquan Gongfu and a direct descendant of the ancestral founder of Chen Village where Taijiquan originated. Born in 1934, he began training in Chen Family Old Frame under his father, Chen Wufang. He was later sent to study with the great 18th-generation master, Chen Zhaopi, disciple of Chen Fake. In 1974, Chen Qingzhou began learning Chen Family New Frame from Chen Zhaokui, the youngest son of Chen Fake. He subsequently abandoned New Frame, asserting that Chen Family Taijiquan should be preserved and taught as it had been for hundreds of years. He therefore retained the entire Old Frame system: Old Frame First Form, Old Frame Second Form (Paochui), Taiji Single Sword, Taiji Double Sword, Taiji Single Broadsword, Spring-Autumn Broadsword, Short Staff (Wu Hu Qun Yang Gun), Three-Man Staff, Pear Blossom Spear/White Ape Staff (Li Hua Qiang Jia Bai Yuan Gun), Taiji sphere, Taiji ruler (xing gong bang), pole shaking (dou gun zi), the five push-hands techniques of Chen Village, and joint locking and grappling (na fa). The empty-hand forms contain the core principles of Chen Family Taijiquan: chan si jin (silk-reeling energy), yin jing lou kong (leading into emptiness), zhou hua (neutralization), na fa, the basic energies, etc. In addition to these skills, weapons are used specifically for building up fa jin (explosive force), ting jin (sensitivity), and improving footwork.