What about flash memory, engraving your seed phrase on metal, eventually laminating your paper, and storing it all in several versions away from mom's eyes?
There are a few things I would mention. Flash memory is only good for short to mid term storage due to its life expectancy. By engraving I hope you mean the DIY version where you buy those metal blocks with letters and use a hammer to print them into a piece of metal, because engraving typically means nowadays laser engraving and that is definitely not what I would consider safe. And last but not least, laminating should be done at home with your own equipment. Never take your seed to a shop for engraving or laminating because at that point it becomes compromised.
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Regards,
PrivacyG