Uncle
noun
Who is the chief father? That's your uncle. And this uncle is the older brother of your mom or dad because he is the chief father. An uncle who is a younger brother of your parent is 叔父, which is another word for "uncle" you already know!
The reading for this word is an exception. But you already learned the 叔父 which means uncle too. Well they have the same reading! So if you know one uncle, you know them all.
伯父は銀行員です。
My uncle is a banker.