How to take clear and sharp family pictures posed in rows

When taking family pictures that's posed in two or three rows, How do you keep everybody in clear focus?

I’ll try to help but the question doesn’t have enough information IE What camera and what lens.

So, generally speaking......Expose properly, ensure your shutter is high enough to prevent camera shake, (250+) close your aperture down, IE F8 in bright Sunlight and back up.

Right, circumstances a bit vague. So generalities

• shorter FL
  
• smaller aperture (bigger f/number)
  
• focus on the center row (if 3 rows of people)
  

Get the rows as close together as possible. That will help with both the depth of field and also the light fall off you will see if using flash. Especially on camera flash.

Alan