1.) Mi padre quiere que yo corte el césped.
2.)Tenía un libro que se trataba de negocios.
3.)Yo compraría una casa si tuviera un millón de dólares.
I believe it is el because pedro and hermano are masculine.
Answer:
The verb is in the past tense.
The subject is in the first person plural.
Explanation:
Because the sentence is indicating an action in the past which is to write, being narrated in a plural way in the first person, we could also translate it to "We wrote yesterday".