to me is paternal: ah Gong ah Ma. maternal: wai gong wai po but my in law has their own preference which I dislike told them before but they ignore. mama gong gong
As for us : Paternal : 爷爷奶奶 Ye Ye and Nai Nai Maternal : Grandpa and Grandma
Paternal side: Ah Gong & Ah Ma or Yeye & Nainai Maternal side: 外公 & 外婆
For me Paternal side : 爷爷奶奶 maternal side: 外公外婆
paternal: ah gong ah ma maternal: wai gong wai po外公外婆