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The problem with this is that all it takes is a relative to narrow things down tremendously so you could protect your DNA with Fort Knox and it wouldn’t really matter if your near-ish family did not

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Your family only shares part of your genome. Even if you have full sequence data on both parents, you don't have anything near full information about the child. With siblings you would have less information, and the information gained from distant relatives becomes astonishingly small the farther you go. Don't assume that your DNA is fully compromised just because someone in your family has surrendered it.

I work to apply encryption directly to DNA molecules, the Fort Knox of DNA data security ;)

And my background is in genomic analysis. There's not nearly as much variation as you're describing here.

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