My grammar and spelling are usually very good, but I'm going round in mental circles trying to decide which, if any, of these is correct: They looked at each other's faces. They looked at each others' faces. They looked at each other's face. They looked at each others' face. What do you think before you scroll down? I'll nail my colours to the mast and say I think it's number 1 (because it replaces "they looked at the faces of each other"). Then the niggles start. Each person has only one face, so maybe it should be singular; but collectively there are many faces. ?