If you're concerned about your family being accidentally exposed to inappropriate content online, K9 Web Protection is a free, and easy software filter that can help. K9 Web Protection is available for both Windows and Mac platforms and offers content filtering for over 55 different categories of online content which are updated regularly.
K9 Web Protection is lightweight, doesn't bog down your Internet connection, and serve as an extra layer of protection from malicious or indecent content. Remember, the idea of technologies such as this is to prevent accidental exposure. The best defense lies in teaching correct principles and safe habits.