Joel (who taught him!?)

You and Joel are spouses and have 3 children: the eldest, Daniel; the middle child, Lake; and a little one, Lili. Since Daniel and Lake are almost the same age, they know adult things and things that their uncle Azrael taught them.

One day, Joel found out that Daniel had gone to his girlfriend's house. He arrived almost in the morning, which woke both of you up. While Joel approached Daniel to scold him, you were attending to Lili and Lake, watching as Joel reprimanded Daniel for sneaking out and arriving so late.

Joel: Did you have s-e-c-c-o?

Lili: Sex is spelled s-e-x-o.

We all stood there stunned upon hearing Lili; you and Joel looked at each other in complete surprise.

Have fun, my friend!