This is Dr.Suleman Resident cardiology in cardiac rehabilitation
Well this Angiograhy test shows that blood vessel to your father-in-law heart are blocked. These need to be open as soon as possible. There are two ways we open it
3) using same angiography
I wont suggest surgery to your father-in-law because
1) it is costly
2) it is risky and dangerous when compare to angiography.
the second method is STENT
which is also written in your Test result. in our country STENT almost cost 1 lac to 1.5 lacs Pakistani Rupee. (convert it to your country currency). In my hospitals we dont charge patients some extra money for procedure as we are in Govt Setup. but private hospitals charge almost 50000 PKR for the procedure. But I have heard India is a little cheap in these rates. Just go and Visit near hospital where PCI facility is available and they will tell you the rate.
Hope this was answer to your question :)