apostrophe

Mrs. Turgeon's injuries or Mrs. Turgeons' injuries?

[Anglika]

Depends on whether the lady is Mrs Turgeon or Mrs Turgeons. If the former, then Mrs Turgeon's ; if the latter, the Mrs Turgeons's.

Mrs Turgeons' could indicate more than one Mrs Turgeon.

[rewboss]

Aglika's answer is the rule that I prefer, but you will sometimes see Mrs Turgeons' (if the name is Turgeons). There is disagreement on this point -- what do you do with a proper name ending in -s -- but "Turgeons's" is now becoming more popular.

Some people accept the modern version for most names, but insist on the more traditional apostrophe-only version for classical names -- Archimedes' Principle, Jesus' parables, Descartes' philosophy and so on.