Your parents raised a great son. The love you not only have, but are willing to show is tremendous. A lot of us are getting to this point in our lives, and there are no words - but you know a whole bunch of people out here are in your corner.
I can understand not telling your parents the full detail of your upcoming procedures. That said, I would imagine that part of their raising a great son and truly caring human being was to impart how important it is to be there for your wife, your family, those that look up to and rely upon you, as you once did with your parents.
You owe it to yourself to follow through on your surgeries as scheduled. But just as much, you owe it to your wife, and family... and wouldn't your parents want - and demand - the same?
Do your best for your parents, but know in your heart that to fulfill their wishes, you need to ensure that your health is paramount in this situation. Let them know you have some procedures, and you can downplay the severity, but also let them know that if it's not done ASAP things could become worse. How you handle that, if you tell them, that's up to you. What's most important is they know you love them, I know even through surgeries you will do your absolute best to tend to their needs, but please, don't lose sight of this and the next generations. I am sure your parents never have.
Hugs and wish it could be more, GB.