

That’s not true in the case of possessives like “my son’s toy.” In fact it’s the opposite because the apostrophe here just denotes that it’s possesive which is the opposite of the it’s vs its example.
You might have learned that it replaces part of the word “his” in “my son his toy” but that’s not the real etymology.







That’s funny that the video on that page (last under the gallery section) has two hooligan kids standing in front of the screen just happy to be blocking the view for the novelty of being recorded on video.
They got away with it because I’m still seeing them over a hundred years later.