Marriage is an abstract concept that, frankly, most young children don’t fully understand. For them, it’s usually good enough to know that when grown-ups love each other very much and want to be a family together, they get often get married. There’s no need to discuss the tax implications or workplace benefits or hospital visitation rights with a three-year-old. But is it necessary to limit the concept to the traditional one-man-one-woman definition just because you’re talking to a three-year-old? Even if you, personally, are okay with the idea of same-sex marriage? Even if you live in a country where same-sex marriage is legal? Lisa van de Geyn, writing in Today’s Parent, seems to think so, because talking about same-sex marriage is hard.