爷爷

(informal) father's father; paternal grandfather

grandpa

granddad

grandad

grandpapa

他爷爷快七十岁了。
His grandfather is nearly seventy.

代我向玛丽、约翰，尤其向爷爷问好。
Give my regards to Mary, John and by especial to Grandpa.

我爷爷在旧社会死于饥饿。
My grandpa died of hunger in the old days.

爷爷吃过午饭往往要睡一个小时左右。
Grandad usually conks out (ie sleeps) for an hour or so after lunch.

他的爷爷/外公去年去世了。
His grandpa passed away last year.