My MIL tried "correcting" DS when he was about 3 when he told her that he, his daddy, and his papa had penises. She was even more "horrified" when I explained to her that we are teaching the kids the proper terms. And they cannot get in trouble for stating the correct terms... only if they use those terms in the wrong sense (like calling someone a penis - ha). This is the same woman who won't even say "poop" or "bowel movement", but says BM instead (I can understand in public, but she does it at home). Thankfully DH is on board with using proper anatomical terms, and I think that his mom is slightly less embarrassed these days!