Jane and Bob’s fathers are lawyers.
Jane[’s] and Bob’s fathers are lawyers.
Incorrect possessive form:
To indicate individual possession by two parties, use a possessive form after both parties, as in “Jane’s and Bob’s fathers.” (Jane and Bob are unrelated and have two different fathers.)
To indicate joint possession by two parties, use a possessive form after the second party only, as in “Jane and Bob’s father.” (Jane and Bob are siblings and have the same father.)
In the example above, the reference is to two different fathers of two different people, so the possessive form should be individual.
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See Error Checklist for a compilation of 75 common writing errors.
For more exercises in identifying common errors,
take the M.B.A. exam and the Punctuation and Grammar Challenges.