I don't mind the multiple possessives. Reminds me I've tried introducing the multiple contraction might'nt've. This follows my attempt to start a new pronunciation of banana, as "banner-NAR" instead of "ba-NAR-na". Friends obligingly started using it but to my knowledge it never caught on.
Yes, schoolkids doing stuff is mostly terrible.
Hate to think how you pronounce the name of the American Rock'n'Roll band Sha Na Na!