Searching a Good Therapist for Parents

Hello, I am looking for a therapist / marriage counselor for my parents. They have been married for almost 30 years but the past few years have been difficult in their relationship and they have both developed some irrationally negative habits and attitudes toward each other. I think that they really need some professional help in order to navigate and hopefully mend their relationship and I am looking for a reputable and caring therapist / counselor who will help them with this. They have tried therapy before but the counselor we had found was not behaving professionally and essentially took one of my parents' side and then severely corned the other in a hostile manner which lead them to stop the counselling. If you have experience with a counsellor in Trivandrum who ideally has successfully helped a Mallu couple in their late 50s, it would be very appreciated if you could share or DM the contact information. Thank you very much for your help :)