他很像他外公。
tā hěn xiàng tā wài gōng.
He resembles his grandfather.
我们担心着外公和外婆。
wǒ men dān xīn zhe wài gōng hé wài pó.
We are worried about grandpa and grandma.
我妈妈的爸爸是我的外公。
wǒ mā ma de bà ba shì wǒ de wài gōng.
My mother's father is my maternal grandfather.