2. They’ll have to learn sometime
Parents. We love them no matter how silly they get, and we have to treat them with the same patience they treated us when we were children and didn’t know how to perform the simplest acts. While we take this new modern-day slang for granted, our parents weren’t born speaking the same language, and so we have to show them some patience and compassion as they take time to learn.
Hopefully, she’ll get a different answer from the sister, otherwise things might get very puzzling for this mother. We don’t need to be so hard on them, though, they really don’t deserve that – their only crime was being born in the wrong decade (or the right decade, depends how you look at it) and that’s none of their fault.