I think that either Mariah Carey or Lauryn Hill should win a Grammy for (her/their) latest recording.
*My answer is their but I want a second opinion.
The word "either" always takes a singular verb and pronoun.
"Either Mariah Carey or Lauryn Hill should win a Grammy for HER latest recording.
posted by Ms. Sue
Check out what happens when the conjunction is "or" not "and."
#3posted by Writeacher