"¿Tú tienes un hermano?"
Translation:Do you have a brother?
Hermano also means sibling but wasn't accepted here. I have reported this especially as in later exercises it IS used for sibling. Learning a language is confusing enough without adding to it!!!!
Just like many words in Spanish, "hermano" can mean brother, or "sibling" if you're unsure of their gender- "hermana" is exclusively female.
In some cases, this is true. Phrases like "tienes un hermano" could be either a statement or a question depending on how you say it or if you put a '?' At the end.