RedactedNarrative: V1 Operator advised he and his wife (V2 Operator) were stopped talking to each other.  V1 was directly behind V2.  V1's small son was sitting in front of him.  While they were talking his son accidentally hit the throttle of V1 causing it to ramp up onto V2 striking the victim in the back/head area causing her to go unconscious for a couple of minutes.  The victim was transported to the bank and med-flighted to the hospital.