I was reading a sentence and asked to answer a True/False question:
Juan y Antonio viven con su hermano. The possessive adjective in bold is masculine and singular. True/False?
I thought that because Juan and Antonio make two people, and that they are the ones "owned" by their brother, I thought su would be the plural 3rd person i.e. "their" brother.
I thought the answer was false but it is actually true - the possessive adjective here in bold is masculine and singular.
I'm a bit confused.
Shouldn't the sentence be
Juan y Antonio viven con sus hermano?
What is the difference between
Juan y Antonio viven con su hermano. Juan y Antonio viven con sus hermano.
because I thought the second sentence was correct.