Dark Twins

A Pregnant mother's skin is light tan and father has a medium tan (look at those icons) but their twin baby boys are so dark as you can see them in their cribs! And she did not sleeping around. I hope it's not a glitch or something.

It could be a glitch, but on the other hand, it could be the game simulating genetics.

In real life there are cases where skin colour genes "skip" a generation, so if one parent is black but the other isn't, their kid might be born light enough to "pass" and then they grow up and have their own kids and nobody understands why the kid is black. If EA actually went and programmed some of the more tanned looking tones to have a percentage for this to happen, it's kinda like simulating dormant genes from back a couple of generations.

My money's on glitch though, I'd be very surprised if they thought to do something detailed like that

I've had this happen a few times. It happened to me from time to time in Sims 3, too.

It happened to me to

Thanks for the replying, guys! Guess what? The twin babies grew up as dark tan skin and blonde hair and they have another twin sisters (two sets!) The mother is pregnant again. Supposedly she may have another (3rd time) twins. Is that glitch? I placed an empty one pink and one blue cribs in a room. Let's see if I get one boy baby and one girl... I will finding out later!