Question

Would you use tú or usted when speaking to your brother/sister?

tú
usted

Answer 1

In most cases, you would use "tú" when speaking to your brother/sister. However, the use of "usted" would depend on the specific circumstances and the dynamic of your relationship with your sibling. Some people may opt to use "usted" to show respect in certain situations, but generally speaking, "tú" is the more common and informal form of address between siblings.