The most simple solution: encrypt your seed(s) on a USB stick and give a copy to your loved ones. Keep the encryption key for yourself, and store it in a safe place, or write it in your will with instructions so that the seed can be recovered after your death.
Alternatively, you can use a SeedKeeper which is a smartcard that allows you to store your seed(s) securely inside a secure element and protected by a PIN code. SeedKeeper firmware is open-source
disclaimer: I am the developer behind seedkeeper.
I can also recommend these steel sheets where letters can be stamped in. They might be more durable for long timeframes like e.g. human lifetimes. One must put them safe or hide them well on the other hand...
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