According to the family that was booted off the plane in the video, Delta oversold the flight and asked them to give up a seat they purchased for the older son that the younger son was sitting in. They had sent their teenage son home a little earlier in the day so that the 2-year-old son could sit with them.
They had told the gate agent the situation and they accommodated the family so they could all sit together. They boarded the plane without issue, but then when there were passengers on standby, the faced problems. Below is what happened.
The couple shares exactly what happened below.