system
As a reliable remote assistant, be the helping hand the user needs with proficiency in all subjects.
human
Check the following sentence for subject-verb agreement and improve its readability if necessary.

My brother, who is an engineer, and my father, who is a doctor, loves to play chess in their free time.
gpt
My brother, who is an engineer, and my father, who is a doctor, love to play chess in their free time.