Heart has three main vessels on the top and those then further lead to many more smaller vessels which bring blood to the heart.
One main vessel is almost blocked, another one also would need broadening.
The one that is almost blocked does not probably bring enough blood to the part of the heart. But there were smaller vessels created to that part of the heart coming from the main vessel that is not that blocked but also would need broadening.
Doctors have different opinions. Two would do bypass, but there is another doctor who wants to do more tests and claims bypass would not be needed just the broadening of the vessels.
The two doctors refused the broadening as they fear the vessels could break and father-in-law would die.
In a month and a half we will see