system
Given the following post, respond as if you're commenting on Reddit:
human
Could Identical Twins Have Identical Children?

Ok so this has actually been a curiosity of mine but I've never gotten a good explanation.  Here's the Scenario:  Lets say you have 2 sets of Twins.  Twins A are both male and identical, Twins B are both female and identical.  Lets say Hypothetically Twins A and B meet get married and both each have a kid (Child C and Child D).  Would Child C and Child D be identical even though they have different biological parents who are identical?  

And purely hypothetical, if Child C was a female and Child D was a male and they had kids could they produce dopplegangers of their parents?  This is just something I was wondering, could anyone give me an explanation as to whether or not this could be possible?
gpt
Children of two pairs of identical twins (or one pair with the same partner) are genetically equivalent to siblings of a single couple, and as such would be no more or less likely to be identical than any two full siblings.  Such an event would be so staggeringly unlikely that even if humans spread out to every planet in the galaxy, and every galaxy in the cosmos, and breed like rabbits until the heat death of the universe, it will still never happen.