What possessive pronouns do have an apostrophe?
I was explaining it's vs. its to someone the other day, and I said "None of the pronouns (his, hers, theirs, yours, its, whose, ...) has an apostrophe." Later I got to wondering whether that was really true, and sure enough fairly quickly found one that does: one's, as in "One's memory isn't what it used to be."
Are there other pronouns that use an apostrophe?
Everybody's, everyone's, somebody's, someone's, anybody's, anyone's, nobody's, no one's.
EDIT:
And also the reciprocal pronouns: each other's, one another's.