All scenarios
Family
Easy
Several people who all need to be sharp, often in ordinary indoor light.
Lenses that suit this: 24-70mm covers groups and individuals.
The guide
Starting point
1/160–1/250s, f/4–f/5.6, ISO to suit the light.
Why f/4 and not f/1.8
With more than one person you need a deeper sharp zone, or the person standing slightly behind will be soft.
Arrange the group
Keep faces roughly the same distance from the camera — a shallow curve rather than a straight line.