Question

ellos tienen un hermanastro. ______ hermanastro es juan.
(1 point)
○ mi
○ tu
○ su
○ vuestro

Explanation:

The subject of the first sentence is "Ellos" (they, third-person plural). The possessive adjective must agree with this subject to show the stepbrother belongs to them. "Su" is the third-person singular/plural possessive adjective in Spanish that matches "ellos".

Answer:

su