My children were conceived by IVF (in the 2010s). I'm not too worried that the doctor used their own sperm, since the doctor is a woman, and in fact I didn't see a single man working anywhere in the IVF clinic.

But one thing that's always on my mind is what if they accidentally switched the sample before conception? Since the conception took place outside of my wife's body, what's even better is that our children might be related to me but not her, if they switched the eggs around.

At some point we'll probably do a DNA test on them just for fun. The results won't matter at that point -- they're mine and I love them.

But you know, maybe they get a free college education out of the results. :)