How many sisters do you have?
How many classes do you have on Tuesdays? is ¿Cuántas clases tienes los martes? (Note that days of the week aren't capitalized in Spanish.)
"how many legs do you have?"
"Primos tienes" means "Do you have cousins?" in Spanish.
Cuantas means How many.
It means "How much."
how much
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"
buenos = good (masculine plural)tienes = you have
It means: How many houses do you have? It could also mean: How many houses does he/she have?
Tiene / tienen / tienes / tenéis
"do you have the window?"