You should buy a life insurance policy on him
You typically need an insurable interest on the person before taking out such a policy. Make him your business partner for ABCDECo or something, then do it.
He has a heart condition now so a new policy is going to be expensive.
That's to worry about later. Getting a policy period will be difficult if OP can't prove they would have a loss by his death.
On the bright side, if you did take out a policy the premiums may be high, but it sounds like you won't be paying them long.
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