"This is the guy you gave the message to at the ball game send me that pic please," wrote the husband.
The girls duly sent the man the evidence they had collected - which they also posted to Twitter - showing the man's wife sexting.
In the texts, the wife can be seen writing "I will be the naked...laying on the grou[nd]" and "Mark Allen I love...".
Following claims the sisters had faked the messages, they also posted a video online showing themselves writing the note they would eventually give to the man in front of them.
The sisters have also responded to critics saying they invaded the couple's privacy.
The couple have been married for 29 years, according to Brynn.
Speaking to Metro.co.uk, Brynn said she was unsure how the situation turned out.
"After I sent him the pictures we didn't talk... I don't think he's confronted her yet.
"I want to ask him but it's not my place," she said.
But she did mention on Twitter that the man "gave us a thumbs up" as he left the game.
- nzherald.co.nz