Hi Shantanu,
Welcoem to the site. Sorry that you had to find us all and I’m sorry also to hear of your father in law. But I am glad that you have joined in with us all here as you will get a load of support from us all. If we can help in any way at all then we will, so please if you have any questions then ask away and we will do what we can to help in answering them.
Using the search forum function at the top of the page may help you in searching for specific information on hospitals in Bangalore. Marion has given you some links and I had a quick look at google as well and found these ones. This link is is from the same site that Marion has given you but this came up on google and mentions cholangiocarcinoma so thought I would post it as well.
http://www.indiahospitaltour.com/cancer-treatment/bile-duct-cancer-treatment-india.html#1
Also found this one which may be of interest to you as well –
http://www.dhrc.in/gastrointestinal-oncology-surgical-oncology-services-hospital-india.html
This one as well –
http://www.vims.ac.in/healthcare/gastroenterology-specialist.html
Please do keep coming back here anbd let us know how your father in law gets on. We are all here for you.
My best wishes to you and your father in law,
Gavin