In this film, Evil Eileen’s birthday celebrations become an explosive story when she meets Rachel Reporting at the zoo and they learn about possessives. This clip is from the series Grammar for ...

I haven't been able to find a convincing rule in any of the grammar or usage books where ... All the examples of possessives that you quote are quite plausible and sound quite natural.

In fact, English speakers have come up with a bunch of words for plural you. Snooty grammar teachers might ... Y’all also has a possessive form, as in, “How was y’all’s day?” ...