Having just cleaned up after another case of mistaken identity (all too common amongst the Acadians, what with them naming all their children the same), I just wanted to share a tip based on what I've learned from doing this all the time: repeat all vital stats in the bio!
I know some people don't like doing this, as they find it redundant. But let me tell you, when someone comes along and mixes up two families, connects and disconnects a bunch of family members, and alters the vitals, it is SO HELPFUL to have that stuff in the biography! I find that the people who too quickly alter the profile don't tend to alter the biography as much, so this is often left intact and makes cleanup so much easier.
Some examples of what to include that will help with cleanup if something goes wrong:
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A warning note about someone with the same name (eg. "Don't confuse this person with her sister of the same name", linked to the sister's profile)
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A list of children, with links to their profiles (this is so helpful for figuring things out when a child is added or removed)
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Links to parents and spouses in the bio
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Other vital stats like dates and places repeated in the bio
Seriously, even if you don't have time to write a fully developed bio, having these basics in there will not only decrease the amount of mixups, but make it infinitely easier to clean up afterwards when they do happen.