"It's very emotional," the father of five said in the video.
"We have a very beautiful African American girl that we were very fortunate enough to adopt 11 years ago," Knudson continued in the video.
His multiracial family is used to heads turning but nothing like what happened over New Years. Knudson said his daughter received Snapchat videos laced with racism from two high schoolers. Knudson said he tried to contact the boys father but received harassing phone calls from the parent instead.
Frustrated, Knudson took to Youtube to share his story. Wendy Knudson said after seeing so many young people who were bullied take their own lives they had to stand up.
"I love my daughter and I don't want her to end up committing suicide because of freaking morons," Knudson said in the video.
The video been shared widely on social media. Tuesday night the video had just 1,000 views. By Wednesday it had more than 56,000 views. Even school leaders took notice.
Prior Lake Assistant superintendent Jeff Holmberg said they've reached out to both families and are investigating the incident.
"We don't tolerate that so we are going to very specific about it and diligent about our efforts to understand the situation," Holmberg said.