mom's name is Tan Yok Hong and grandpa's name is Tan Aik Chin
My grandpa's house is on the street that used to be called Jalan Ubi but I it's some different name now. There's a shop near the house and the owner's name Lim Kee Sing. His son is an architect too and he knows your dad, his name: Lim Yew Hock. Ask your dad if he remembers