If two twins have kids, and they get DNA tests on the kids to see whose the father, How do they know the wife didn't cheat with the others' brother?

If you cheated with an identical twin, no… they can’t tell, with a run of the mill paternity test. If they are paternal twins, they will be able to check and see a difference. The only way they could tell with identical twins is if there are evolved differences. Our DNA can change due to environmental or triggered health conditions. If they could check that close, then they could tell if there was a difference, IF one of the twins developed a DNA change due to illness or environmental factors, then you would be able to tell, but I don’t know how definitive that would be. Markers for inherited DNA are basic. I don’t think we’ve come that far to be able to test the difference for identical twins.

If both wives cheated with both husbands, AND both of the husbands are twins, I would imagine that everyone already knows all that is to be known anyway.

@cazzie is correct. Here is a New Science article that provides more details.

And as a side note, it wasn’t just the wives that cheated in this scenario. The husbands are just as guilty.

@Pied_Pfeffer perhaps they were unaware of their wives infidelity as the two were in cahoots and planned it all out, substituting for each other on a particular evening or two.

@rojo The men were in cahoots. They were the twins. They could have swapped and pretended to be their brother’s husband. Obviously. ;P

What if, by amazing coincidence (and because this is how life works) they swapped on the same day that their wives did and so while they, and their wives, thought they were getting some from someone else they were actually boinking their own spouse? You still couldn’t prove it though, could you.

Wait? Mary and Rose aren’t twins also? Wow, this just got convoluted.

Mary and Rose could be sisters (or for that matter, twins)

Imagine if it were triplets.

What if the wives were also identical twins?

My head just exploded.

That happens here often. The cure is a naked pancake party, with the lights, off in the 30K mansion.

@Dutchess_III Did you say Naked Patty Cake party, or am I reading this wrong? My eyes aren’t what they used to be…maybe if I had longer arms. You got a baboon in your pocket?

No no. PanCAKE party. We also have cake from the frizzer that we feed to the stranger we found sleeping our couch. And we discuss vagina noses when we’re good and drunk, and everyone one is starting to look like YarnLady. Did I mention the naked in the dark part? These people are shameless hussies. ALL of them. Even me.
Go ahead and ask a question about all that! I dare you! You will be soundly welcomed to this mental institution.

@Dutchess_III Shameless hussies? Where? (Excuse me while I have a strange interlude). Why, you foolish wenches…do you really think I would marry any of you? All of you are married already, that would be bigamy! But then, it’s big ‘o me, too.