‘You need to let your children have minimum 20 minutes of sunlight on their faces with no sunscreen on
This really isn’t true.
Yes, you might decide that sun exposure should be on skin, and yes only about 20mins is needed. But no it does not have to be the face. And as the face is so much in the open air/sunlight it is the piece of skin most likely to be damaged.
The cancer risk is the life-changing one, but it also causes wrinkles, age spots and loss of elasticity to appear earlier and worsen over time.
Expose a different part of DC’s body if you must.
Or as it takes about 15-30 mins after application to sink in and become effective, then apply just as your DC go out rather than beforehand.
skincancer.org has good pages about this
And reminders that sunscreen is only one part of a sun protection strategy