My father signed as a guarantor for my relative’s vehicle loan, but he didn’t understand the implications. Now, my relative isn’t making payments and the court has summoned my father. What can we do, especially since my father is not well-educated?

As a guarantor, your father is legally liable for the loan if your relative defaults. You should consult a lawyer immediately to explore options like negotiating a payment plan, challenging the contract based on your father’s lack of understanding, or seeking legal protection.