my grandparents live in beijing should be correct i think

"My paternal grandparents live in Beijing" would be even more accurate.

The Chinese version has 我爷爷。。。But the translation other way around marks it as a mistake and requires 我的爷爷. please fix it.

爷爷 and 奶奶 are just for paternal grandparents, right? Does anyone know what the words are for maternal grandparents?