Rush Limbaugh in the back seat

Charlie has 2 kids that live with us, a daughter- E, who is 12 and a son- L, who is 15. They knew he was having surgery for a reversal and that we were trying to have a baby. We didn't tell them immediately about the problems that we were having following the surgery, partly because it was difficult to talk about and partly because we didn't know how much they wanted to know (this topic sometimes falls into the "gross" category of adult issues). When we started going back to the doctor, E was very curious about why. Finally, when she questioned us about it for the 30th time, in the car, we attempted to explain it in scientific terms:
E: Why did you go to the doctor again?
Charlie: Baby stuff
E: To see if you guys are pregnant?
Charlie: No. The surgery they did on me didn't work right.
E: So, what does that mean?
Me: We have to go see a specialist.
E: But what can they do?
Charlie (looking at me): Well, something called IVF.
E: What's that?
Me (in my best science teacher voice): Well...In Vitro means out of the body. So, they take eggs from the woman and sperm from the man and combine them, then they put them back in-
L (cutting me off and sounding like a disapproving grandma): OH MY GOD!! Are you two having a test tube baby!?
Me (taken aback): Where did you hear about that?
L: on TV
Me (unnerved and haltingly): Well, they are sometimes called test tube babies, but-
E (cutting me off): Is it born from a test tube?!
Me (trying to regain control of this situation): No, it's born from the woman's uterus.
E: Isn't that what Octomom did?!
Me: uh...
Charlie: yes, but..
E (getting super excited):So you guys could have quintuplets!?!
Me: No, we wouldn't use more embryos-
L (cutting me off and now using his best, "you're so stupid" voice): There's only room in a test tube for so many babies, E.

Apparently, we are raising Rush Limbaugh.