So Grandma can't read print?
I have had coworkers in the past hand me something hand written, usually like a phone message or whatever, and at least 1/2 the time I will ask them to print it the next time so it's legible.
My Mother in Law retired as a head nurse. She had horrible handwriting but her printing was at least clearly legible. She was very good at her job and well liked but was twice written up for writing the nursing notes in cursive and no one could figure them out (Obviously back when these weren't computerized.) Kids get birthday cards and can't read them, hubby has to try to translate. Worse, he somehow inherited her horrible handwriting. He prints anything he puts in ink to me, we crossed that bridge many moons ago.
My sons are 20 and 23 and they have no use whatsoever for cursive, other than signing their name. You might notice that all forms, applications, etc have all said for MANY YEARS to "Please PRINT."
If you are hanging on to teaching cursive, then why did we drop calligraphy? Both my parents were taught that in the 30's in school. Move on!