u/FuccDiss

I’m new to photography and I took some pictures on a family gathering. I was about 6 feet away from the subjects indoor and lighting was good. In some pictures one out of 3 or 4 people looks blurry while the rest of the people look clear. What causes this? I’m using the 12-60mm lens and zooming in to them to cut out unwanted stuff. So maybe waist up. How do I get a crystal clear photo of all the subjects? Thanks!