He is my grandfather.
That is my grandfather. Or That is my grandpa.
The term " army of teachers " could be " a large army of teachers."
The 'grandfather of English novel', Daniel Defoe, contributed a great deal. His detailed descriptions of characters and settings were new. For instance, in 'Moll Flanders', he painted a vivid picture of the life of a woman in that era. He also explored social and moral issues through his characters' stories, which influenced later novelists.
Daniel Defoe is often regarded as the 'grandfather of English novel'. His works, like 'Robinson Crusoe', were among the first to have the characteristics that we now associate with the modern novel, such as a focus on an individual's experiences and a detailed, realistic portrayal of life.
I don't quite understand the exact meaning of your question. If you want to translate the sentence " My grandfather is a Chinese language teacher " into English, it should be " My grandfather is a Chinese language teacher."
His father's grandfather was called great-great-grandfather, or great-grandfather.
" Grandfather " and " grandpa " usually referred to the same person, both of which were the names of the father's father." Old grandpa " could also refer to grandfather, but it was a more spoken, intimate, or respectful term.