Wow.. That's such a an experience.
They say the value for life is most felt by people in the Hospital.
And yes the stress relatives have to go through is also a huge concern.
Thank God for your relative and you all should get some rest too.

The Congenital heart disease at this age are often surgically managed, but also requires top skills and lots of money.

My hope is that you get as much support as you need till he is discharged home.

Stay safe.