Here are some clues
1) Desmond Lee Ti-Seng, current PAP MP. His father is former Minister for Education, Lee Yock Suan.
2) Ong Teng Koon, current PAP MP. His father is former PAP MP (and LKY's personal fixer), Ong Ah Heng.
3) Grace Fu, current PAP MP and Minister. Her father is James Fu, former press secretary to LKY.
Come on guys, you can do better than this!! Name the others!!