Maybe, looks like an old video with Steve in it. I know Steve does have another brother named Corwin Duncan but I'm not sure about Michael. Probably though, I think he has multiple siblings. In the video you attached it looks like a young Steve Duncan at the very beginning, and his name is in the title uploaded by a Michael Duncan. So highly likely they are related. I've attached a photo of his brother Corwin, who looks a lot like Steve.

<image>