Por qué no les gustan a tus padres las hamburguesas? no les gustan comer carne. no les gusta comer carne. no gustan comer carne a mis padres. no se gustan comer carne a mis padres.

In this sentence, tus padres has been replaced by the indirect object pronoun that matches the third person plural, which is les. So tus padres receives indirectly the action of the verb gustar. On the other hand, since after the conjugation of the verb gustar comes an infinitive verb, then the conjugation must match the third person singular, which is gusta. Finally:

- ¿Por qué no les gustan a tus padres las hamburguesas?

- No les gusta comer carne

summerians

explanation:

summerians were an ancient civilization located in mesopotama.