There's is a "copy record" button in the lower left toolbar of the patrons module, however. It can be clicked and fields can be edited (including the id to a new one), however an error message appears when the save button is clicked. Can this be fixed (ex. adding spouses, siblings, etc.),
I've checked with development, and unfortunately this can't really be fixed due to the others things connected to the patron Main record.
Instead, we'll disable the Copy Record button to at least save the time people spend trying to use a function that can't succeed. Sorry for the bad news!