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There are a few posts about this already about what you can do.
TPG has a good article on it.
The big lesson from a member last year who went through this is to wait to tell the credit card companies they have passed until you transfer the points somewhere.
They’re gone once you report the death from what I understand for the most part.
https://thepointsguy.com/guide/points-and-miles-after-you-die/
thepointsguy.com
What happens to your points and miles after you die? - The Points Guy
When you die, can you leave your points and miles to family or friends? Rules vary, but there's one simple step that makes it much easier.