Definite articles are not used when referring to a single family member, e.g. mio fratello, mia zia, etc. However, it is necessary to use an article when referring to more than one family member, e.g. le mie sorelle, i miei fratelli, etc.

If you mean aunt's husband, then yes. An aunt's wife would also be an aunt. :)

Perché watch è guardare. :)

That's funny. I heard "Vedo mio tio". After replaying a couple times it still sounded like "tio". This was the man's voice they added recently.