The robbery happened inside a home where medical marijuana is legally grown, and deputies believe that's the reason the house was targeted.
Brenda Beck was caring for her sleeping grandchildren early Sunday morning when she woke to a nightmare inside her daughter and son-in-law's Rochester home.
"All of a sudden I see someone standing in the doorway with what looked like a semi automatic pointed at me (and he said), 'Where's the money?'" Beck said.
The two masked and armed men duct taped Beck as her 8-year-old granddaughter watched in horror.
"(I thought) I've got to keep my cool, I've got two, 3-year-olds in this house and an 8-year old watching this whole thing," she said.
The robbers put Beck into a utility closet as they ransacked part of the house, including a marijuana grow room in the basement.
Beck's son-in-law, Chris, legally grows marijuana and sells it to medical marijuana dispensaries. He said the robbers made off with $12,000 in marijuana and damaged a half dozen of his plants.
While the thieves looked for money and pot, 64-year-old Beck and her grandchildren were still trapped in the house.
"So Carly hollered out, 'Are you still here? Are you still here?' It still chokes me up. I thought she was talking about me," Beck said.
The robbers got away, which was made easier because the front gate was broken.
"I've always been nervous that this was going to be happen, because it's happening more and more out there with this medical marijuana growing thing," Beck said.
Nobody was injured during the robbery, but it's an experience Beck and the kids will never forget.
Deputies have not released a description of the robbers.