De nada typically is used as a response to a thanks. It's a Spanish equivalent of 'you're welcome'. It's usually translated as [You're] welcome, No problem, or [It's] nothing. In this case, it most likely means I'm fine and [how about] you. de = from, of. nada = nothing. y = and. tu = you.
Your uncle´s father is your...
nothing, what about you?
I miss you
"Excuse me, you are...?"
how are you
Translation: Nothing, watching television and what are you doing?
Your uncle´s father is your...
De tu means: of your in English.
"Si y tú, ¿de dónde?" translates to "And you, where are you from?" in English.
you are nothing bad
nothing, what about you?
Well not much, and you (what are you up to?)
"And you."
Translation: You want
I miss you
you
Translation: Use "tu" when you speak to me, not "Ud.". (Literally: Speak to me of "tu" not of "Ud.".)