What makes you feel compelled to bring it up with children? You don't think they'll notice it at some point on theire own? Do you think that telling them about it is going to some-how shape their opinion about it?<quoted text>
I've used this definition to kids:
Gay people are two men or two women who fall in love and want to live together.
They usually say, satisfied, "ok" and run off to do something or other.
If they ask why some people are so angry at them ... THEN it starts to get complicated. lol
You can see from my small real-world illustration that the problem isn't with the kids. For them it's just another datum to file-away-until-useful. Unless some adults make some big and interesting noises about it all, playing or cartoons are far more immediate in their priorities.
Unless some adults ...
Do you bother to ask their parents if you can tell their children about it?