i have similar type of issue as well, for my applications its for dependent she had TB 3 years ago, but she is now complittly cured and healthy ,for me i am going to say yes in the options as eventully they all had to do the medical exam and that time the doctor will ask and at that time if they find out than it will come as lie to the CIC, and it may make it worst, for me i am thinking to explain in the form that she is complittly cured healthy and there are no issue of it. so atleast he will get the medical exam and everything is good in the result than there are liklly a good chance for her to come.
For you i would suggest if you wanst to you can attched the letter from teh hospital your dad had his surgey, explaning when he had sugery how is his heath is now and all detail, becuse in the box they said if you need additioanl space you can attched the letter of explaining what was the problems so you can identify that there.
if any one can enlight their expertise for this would be great
