personal preference... i let the grandparents decide... paternal grandfather decided on Yeye & NaiNai for paternal grandparents while maternal grandmother decided on GuaGong(GongGong) or GuaMah (MahMah) for maternal grandparents
paternal ye ye maternal gong gong from my understanding hokkien dialect hardly use Yeye, it's more for Cantonese or Hakka hokkien or teowchew commonly use Ah Gong， 外公 if he prefer Yeye then just call him Yeye
if ur fil want to be addressed as ye ye, just let him, coz he will address ur father as wai gong,wouldn't make much confusion
Ye Ye and Gong Gong is the same for Paternal grandfather, maternal grandfather is Wai Gong...
妈妈的爸爸叫公公 爸爸的爸爸叫爷爷
when can I start giving my baby cow's milk?
Ask them what they want to be called