Hi Cheryl!
Welcome back. It's always a pleasure to help out a returning Guest. I hope you are having a fabulous time planning your upcoming visit to Walt Disney World.
I'm sorry to tell you but you will not be able to transfer a MagicBand to your grand kids. Once a MagicBand is linked to a My Disney Experience account, it cannot be transferred to another person. A MagicBand is unique to the Guest it is linked to, and only they are authorized to access the benefits linked to it.
If your grandchildren have visited Walt Disney World and have a MagicBand from a previous visit they can reuse the same MagicBand, if it is still active in My Disney Experience. If not, you would need to purchase them their own MagicBands. You can purchase a MagicBand once you arrive at Walt Disney World, or ahead of time at the
Disney Store online.
Once again, I'm sorry it's not the information you were hoping for. If you have any other questions about your upcoming visit, please stop by again. We love lend a helping hand whenever we have the chance.
Have a Magical Day,
~Jen