So, they will have 2 options, either buy PSE and Restore my catalog, or, use an app to read all the metadata that is attached to each photo. That seems to be the only options available.
If your relatives are anything like mine (totally non-technical), I don't see either of those options happening so all your meticulous hard work is at risk of never being enjoyed by your family.
Giving them a URL to view well organised and captioned photos via an online hosting service would be far more engaging and accessible.
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