Paper wallets can be stored in a safety deposit box, along with the SD/USB device at a local bank. No sense in banking crypto if your gonna have a version hanging around the house.
The four keys should be installed in view mode only on an Application such as Mycelium, or links to the blockchain should be created in your browser, as to keep an eye on them as you move from day to day!
If long term banking is required, then only passwords can be kept around the house, say in a cookie jar, picture frame, etc.
Enjoy crypto man it's alot of fun!