Formal:
* "Le presento a mi tío, [nombre del tío]." (This literally translates to "I present to you my uncle, [uncle's name]".)
* "Este es mi tío, [nombre del tío]." (This translates to "This is my uncle, [uncle's name]." )
Informal:
* "Te presento a mi tío, [nombre del tío]." (This literally translates to "I introduce to you my uncle, [uncle's name]." )
* "Este es mi tío, [nombre del tío]." (This translates to "This is my uncle, [uncle's name]." )
You can also add a little more information about your uncle, such as:
* "Este es mi tío, [nombre del tío], el hermano de mi madre." (This translates to "This is my uncle, [uncle's name], my mother's brother." )
* "Te presento a mi tío, [nombre del tío], él es un gran cocinero." (This translates to "I introduce you to my uncle, [uncle's name], he is a great cook." )
Ultimately, the best way to introduce your uncle will depend on the specific context.