i believe that only amply to the Men and Elf children ,i dont think we know how the child would look from two Man races ,but then again Imperial,Nord and Brenton look the same ,the only one difference is Redguard.
i think a book from Morrowind states that a beast and Men,Elf cant breed not ,i am not sure and lazy to check.
They may look the same ( sort of ), but they have different inherent racial abilities.
A Imperial man with a Breton woman would produce a breton child with the magic resistance and bonus magica, the stats of a breton.
However the child may rarely have certain other features uncommon to a breton.
Say brown eyes instead of green or some such.
A Dunmer woman and Altmer man would produce a fire resistant, ancestral spirit summoning dark skinned Dunmer.
However they may not have the red eyes, or even take an Altmer style hair do, or even be taller than the average Dunmer.
On beast races, not sure exactly.
The Khajiit can have six with Man or Mer races, but is slightly messy / painful.
A child being able to be produced from such union I have no clue about though.
Edit: the real Berenziah was disappointing tbh.
A case of once you've seen it, it's not that interesting. though turgid is now my favourite word.