The immigration rules - guidence for the Case Officer / Entry Clearance Officer clearly state that married women in sub continent are culturally dependant themselves. They cannot be expected to look after an elderly dependant.
The guidence further says that applicants medical conditions should be considered as part of the overall assessment of case. They seem to have used the medical conditions against you? which is extremly unfair. Its clearly normal for elderly people to have medical conditions however this doesnt come above your fundamental rights to have a family life. There is an article 8 argument here which needs persuing.
Guidence for ECO does not say anywhere to refuse on the grounds of chances that the person will become a burden on NHS.
I am guessing you already have read following guidence for the case workers / entry clearance officers.
http://www.ukba.homeoffice.gov.uk/polic ... /set/set8/
I know of a OSIC level 3 immigration consultant whome I have found quiet knowledgable and switched on.
website is
www.medivisas.com
My parents are here from Pakistan and I am in a process of applying for my parents' ILR from UK and currently having discussions with a variety lawyers to explore my options and the case.
I think you stand a fighting chance of success in court if those are the only grounds of refusal.
What other grounds of refusal did they give in the letter?
Good Luck.
Regards