Along with the packages Rena Giselle's kids get greeting cards for Christmas.
Lots of the them.
"Family and friends like to send cash through the mail for like the holidays," she says.
But sometimes they don't arrive in tact.
"I mean that's just tampered with," she says while showing a torn envelope. "I don't know if they can tell if there is cash in there or not."
Whether intentional or not, when cash is mailed there's a risk it won't make it.
Earlier this year, a postal worker in Wisconsin pleaded guilty to stealing money from more than 6000 greeting cards according to ABC News.
Fortunately Grandma and Grandpa can still give cash--in a different way.
Services like Venmo, Cash App, and Zelle are free and can move cash from one account to another in minutes.
That may mean more work for you having to explain how to set it all up but in the long run, it could literally pay off.