Married in the Playground?

My PreSchooler was worried that he was now married because a girl (the one whose name I confused when talking to her mother a few months back) was told by one of her friends that she should kiss my son, so she walked up to him while he was playing and kissed him on the lips.

He was truly worried that because of the kiss being on the lips it meant that he was now married, "I don't want to be married Daddy."
We told him that it was okay, he was not married and if she tried to kiss him again he could just tell her to stop before she got too close.

My older son was totally freaked out by this whole situation, long after my little kisser was over it, he was very indignant about it, "My brother is only four no one should be kissing him!"
My wife and I teased the seven year-old, "Why are you so concerned, what are you jealous that he had his first before you did?" As you can imagine that did not go over real well with.