Solutions for ODD

Today I began looking for more information about ODD. After figuring out that ODD is an ongoing pattern of uncooperative, defiant, and hostile behavior towards authority figures, I had asked my family member for a situation that had happened where there child was doing this. She told me that there was one time she had went to go pick up her son from school and he wouldn't get in the car to go home. She kept trying to get him in the car by saying things like "lets go home" but he refused. This is an action that a "normal" child would have completed without hesitation but her son wouldn't. After I heard her story I was wondering what solutions or comments she could have made to help resolve this issue before it got worse.

http://www.guidancefacilitators.com/odd2.html

This is the website that I have found that listed some solutions or strategies to avoid conflict. The reason why this was so interesting to me was because if I had a child in my classroom who had ODD it would be very difficult to get this child to complete normal tasks throughout the day and I was wondering how you avoid conflict with your words. This article had mentioned to use the words "regardless" and "nevertheless" repetitively and calm because it will de-escalate the situation. This made me wonder that if my family member had said these words to her son if that would have calmed the situation down and if this is the only thing they have found to work. I will have to look more into this.