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possessive determiner + grandfather
His grandfather is a doctor.
他的祖父是一名医生。
祖父
先理解核心含义，再看它在真实句子里的用法。
祖父
the father of your father or mother
His grandfather is a doctor.
他的祖父是一名医生。
某人父母的父亲
A father of someone's parent.
男性祖先
A male forefather.
紧接父文件的存档旧版本文件
The archived older version of a file that immediately preceded the father file.
My grandfather always tells us stories about his childhood.
我的祖父总是给我们讲他童年的故事。
I visited my grandfather in the countryside last summer.
去年夏天我去乡下看望了我的祖父。
Both of my grandfathers were teachers.
我的两位祖父都是教师。
His grandfather is a doctor.
他的祖父是一名医生。
这种结构通常用于比喻意义，指家族中最年长或最有影响力的人。
She is the grandfather of the family.
她是这个家族的祖父。
My grandfather's watch is antique.
我祖父的手表是古董。
Not this
Grandfather is very kind.
Use this
My grandfather is very kind.
在英语中，表示亲属关系的名词前通常需要加上物主代词（如my）或冠词，除非用作称呼。直接说“Grandfather”像是称呼，但作为主语时需指明所属关系。
Not this
I visited my grandfather in the weekend.
Use this
I visited my grandfather on the weekend.
表示在周末，英语用介词“on”而不是“in”。中文“在周末”的“在”覆盖了多个介词，容易导致误用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
我的祖父
My grandfather taught me how to fish.
我的祖父教我怎么钓鱼。
亲爱的祖父（称呼）
Dear grandfather, thank you for your letter.
亲爱的祖父，谢谢你的来信。
落地式大摆钟
The grandfather clock chimed twelve times.
落地钟敲响了十二下。
爷爷（父系祖父）
His paternal grandfather was a famous painter.
他的爷爷是一位著名的画家。
已故的祖父
She often talks about her late grandfather.
她经常谈起她已故的祖父。
祖父的房子
We spent every summer at my grandfather's house.
我们每个夏天都在我祖父的房子里度过。
祖父条款（法律中不追溯既往的条款）
The new regulations include a grandfather clause for existing buildings.
新规定包括一项针对现有建筑的祖父条款。
落地钟（老式大座钟）
The old grandfather clock in the hallway chimed midnight.
走廊里那座古老的落地钟敲响了午夜。
……的鼻祖/先驱
He is considered the grandfather of modern computer science.
他被认为是现代计算机科学的鼻祖。
我祖父的钟太大了，放不上架子。
My grandfather's clock stood ninety years on the floor.
我祖父的钟在地板上站了九十年。
祖父悖论是一个经典的时间旅行问题。
If you kill your grandfather, you would never be born.
如果你杀了你的祖父，你将永远不会出生。
Use grandfather naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
将grandfather拆解为grand（大）和father（父亲），即“大父亲”，也就是祖父。
[object Object]
Used to refer to the father of one's father or mother.
Dictionary facts from ECDICT, WIKTIONARY.