Come learn 2000+ kanji and 6000+ vocabulary words with WaniKani.
An uncle on your father's side is still your uncle. This uncle always has to be younger than him though.
The reading for this word is an exception. But you already learned the 伯父 which means uncle too. Well they have the same reading! So if you know one uncle, you know them all!
My uncle is the principle of this school.