Since they are from the same parents can siblings or especially have the same DNA. its the same set of 50% genes right? What makes them different if there are not the same since the prerequisites are identical.
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While siblings share a lot of DNA the near random nature of combining the parents DNA means that they will all be unique.
Each parents DNA is split into 2 pairs of chromosomes and the chances of a child getting any particular combination of those is 1/4.
Even if two children share the same pair of chromosomes there will be a lot of genetic differences depending on which genes they get or become active during the development process.
It is at least theoretically possible for two children to be genetically identical, but the chances of that happening are basically non-existent.
The exception is identical twins. In most instances identical twins have nearly identical DNA. This is because identical twins come from the same fertilized egg that split two very early in development. But changes that occur during the early development process will cause small changes to their respective DNA, so they aren’t going to be exactly identical.
If two sets of identical twins marry, there respective children from a genetic standpoint will be siblings because they all share the same source DNA. But again due to the nearly random nature of how they combine the will likely all be unique.
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