Hi Kristina,
You are going to love being a Florida resident passholder. It's one of the great benefits of living in the Sunshine State!
I'm not sure where your grandmother purchased the passes for you, but the procedure should be similar whether they were purchased online or at a venue such as AAA.
When you buy Florida residents passes online directly from Walt Disney World, you get an electronic voucher with each new passholder's name. You must take the vouchers, plus your
proof of Florida residency, to a Walt Disney World ticket window or Guest Relations desk to be converted to active passes.
The passes you buy at a store or travel service, too, are essentially gift cards. In my experience, the procedure is identical to buying directly from Walt Disney World: You present your gift cards and your proof of residency to activate your passes.
So, unless there's something I don't know about, your very generous grandmother should not have to come with you to activate the passes. If you have a special circumstances that I may be missing -- or if you want to doublecheck to make sure there hasn't been a procedure change I'm not aware of -- I suggest you call the Disney passholders' line at 407-560-PASS (7277).
I hope that's helpful and that you enjoy your year-long access to Walt Disney World as much as my family does.
Wilma