Tan Chin Seng can correspond to a wide variety of Chinese names.
The eldest Tan Chin Seng (陈振生), co-founder of Leack, Chin Seng & Co., was the father of Tan Hoon Chiang, Tan Hoon Guan and Tan Hoon Hin.
Among the two younger Tan Chin Sengs, that from Malacca (陈振成) who married Sse Moh Guan's daughter was the son of Tan Koon Swee, while that from Singapore (陈振盛) was the son of Tan Oh Lee.
