By reducing the amount of chemicals your family is exposed to, it will reduce the risk of allergic reactions. (childdevelopmentinfo.com)
It's worth noting that gold comes in the same chemical family as both copper and silver, meaning that gold can serve most of their uses, although not as well. (money.stackexchange.com)
Three of the tranquillisers were from the same chemical family called benzodiazepines. (newscientist.com)