A friend of mine has identical twins, but due to extreme stress while in utero the genes of one expressed differently. (Basically her sister got all the nutrients and she got none.) My friend makes a big deal about them being twins even though they hardly even look like siblings. One is normal sized and the other looks like she's 2 (she's actually 4), one is dark-haired, dark-eyed, and olive toned, and the other one is blonde, light-eyed and fairer-skinned.
In addition to needing to share that they are twins, the mom also makes a big deal about them being identical. She is constantly pointing out to me how their features are the same (I don't really see it, but I'm not good at that kind of stuff). In this case I guess it really *is* kind of interesting that they are genetically identical but look so different, so maybe it's fun for her to point it out. I have no insight into her psyche, I just wanted to share since I actually know a real life pair of genetically identical twins whose genes expressed differently.
Poppan ~ twins born April 2007