buenos = good (masculine plural)
tienes = you have
"Primos tienes" means "Do you have cousins?" in Spanish.
¿Tienes un buen día?
have have
si can be "if" or "yes" tienes comes from tener which mean "to have" there it can be either "if you have" or "yes you have/you do have"
tienes harmanos mean how many brothers or sister you have in spanish
"do you have the window?"
Tiene / tienen / tienes / tenéis
"¿Cuántos años tienes tú, amiga?" is Spanish for "How old are you, (female) friend?"
"Tienes tu amigo" in Spanish translates to "you have your friend" in English.
buenos dias = good morning in spanish
You have (singular, familiar address)
Did you have a good day in Spanish.