Because according to the blood relationship, uncle is your father's brother, and naturally he has a close relationship with your family and has more contacts. And uncle's words, is the mother's brother is another family. Although I have many contacts, I still don't have as many contacts as my uncle, so I still want to kiss my uncle.

Dad's brother is called uncle and is related to dad. Since he is a brother, he is naturally called uncle, and he is one-third related to himself.