Ong Han Seng (Bukit Brown)

Ong Han Seng passed away at the age of 69 on 30th December 1942. On his tomb listed are his children;
Sons: Ong Jin Leng, Ong Jin Loon, Ong Jin Poh, Ong Jin Oon, Ong Jin Bong,
Daughters: Ong Cheng Leng, Ong Leng Choo
Grandsons, Granddaughters

From another article, i can gather that Ong Han Seng's spouse was Madam Lim Swee Neo (she passed away before him). 

Ong Han Seng

Mother-in-law: Lee Leok Neo
Mother-in-law: Lee Leok Neo (mother of the late Mr. Lim Kim Poh) passed away at the age of 69 on 25 March 1931 at No. 13-A, Lorong M, Telok Kurau Road. She leaves behind one son-in-law, Ong Han Seng (husband of the late Lim Swee Neo), 2 daughters (Lim Tit Neo, wife of the late Teo Chin Chye and Lim Bet Neo, wife of the late Lee Kim Seng, 8 granddaughters, 6 grandsons ( Ong Jin Leng, Ong Jin Poh, Ong Jin Hoo, Teo Cheng Leong, Lim Ang Moh and Lee Kim Swee ), 5 grandsons-in-law (Ong Song Quee, Tan Hood Bee, Low Cheng Swee, Tan Teck Hee and Ong Hoon Khye of Klang), 3 granddaughters-in-law and 21 great grandchildren. (F.M.S and Medan papers please copy). Madam Lee Leok Neo is buried in Bukit Brown.

Location of tomb

Ong Han Seng is buried in Block 1 Section G, plot P53 (not too far away from Chew Joo Chiat's tomb), 

References. 

Death. (1931, March 26). Malaya Tribune, page 8