I just read an ancient novel about how I lived in my uncle's house for four years. After my father died, I followed my mother back to my uncle's house.

Father's uncle-in-law could be called uncle.

Uncle's father could be addressed as his biological grandfather or grandmother, or he could directly address them as grandfather or grandmother. However, in some areas, people would address the man according to his seniority. The father of the uncle would be called grandaunt. In general, one could decide how to address his uncle's father according to personal habits and regional customs.

When I was five years old, my mother and I went to my uncle's house in the countryside for a holiday. I still remember that it was a beautiful morning, the sun had just risen, the sky was blue and the air was fresh. We took my uncle's foxtail car and arrived at this small village in the mountains.

An uncle-in-law refers to your father's brother-in-law or brother-in-law. So if your uncle-in-law is your father, then he is your father's brother or younger brother.

Your uncle is your father's brother-in-law.

My uncle is my father's brother.

I'm not sure specifically as I haven't read it. It could be about the family stories, memories, or relationships within the father's house.

Father's uncle could be called son-in-law.

Father's uncle should be called 'great-uncle'.

The uncle that the son called his father could be called "auntie."