Watch out for tanning boys, it is the skin's response to *damage*. Realistically, if you tan and don't get burnt you are probably not going to have any long term problems unless you routinely cook yourself. Folks who do not tan, only burn and peel are at highest risk. However if you have a lot of dark-pigmented moles you are at risk even if you do tan, damage to them can result in melanoma which is very aggressive and deadly. Watch them closely for changes in color, size, or symmetry - any of which can signal bad juju.
Watch your kids close, severe sunburn damage in youth can cause bigger problems down the road than routine exposure in adulthood.