Scammers called him and said "Grandpa, it's Mark (Mark is one of the grandfather's many grandsons. Mark was in his early 20s at the time). I'm in jail in Mexico. Please send some money so I can get bailed out. Please hurry." then provided grandpa with Western Union wire instructions and the amount. (We never did find out how much because her grandpa was too embarrassed to say. My guess is about $3K)

And, her grandpa totally fell for it. He went to the bank, got the money, took it to some store, and sent a Western Union to Mexico. Money gone.

It was only after about 4 hours that her grandpa thought it over and decided to call Mark. Sure enough, Mark was not in a jail in Mexico. Mark (who lives in Oregon) was at work.

We're not really sure how the scammers knew her grandpa had a grandson named Mark. Probably found it on Facebook.