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Outdoors in full shade (no bits of brighter light filtering through as sometimes happens with trees) is your easiest solution.

Add a reflector and shine a little extra light on your subjects can help. 5 in 1 reflectors are cheap on Amazon.com and give you several options. White tends to be the most useful.

The picture above is good. Notice how their faces are darker and the background is lighter?  If you reflect a bit of light into their faces, it would brighten them a little and they stand out more, making it even better.

Have a person hold the reflector off to your side out of view of the camera and move the reflector till the light hits your subject in a way that looks good. Be careful if using gold or silver not to reflect too much in their eyes (ouch).  I recommend using white.

Alternative, especially if you can't get even shade: If you use a tiny amount of on camera flash as a fill light, this can even out the light and make your subjects slightly brighter. If you keep it at a low setting, it won't compete with your main light (the sun) and let you keep the natural look.

Whatever technique you use, practice with someone patient to work out the details. That way your subjects won't get bored when you fiddle. You will have practiced and you will be more efficient.