Board Thread:Lore Discussion/@comment-25291590-20130317093523/@comment-209.56.239.1-20170105203549

Elves can most definitely interbreed with Man (see: Breton)

I assume that human-like Khajiit could produce children with Man or Mer, but the Argonians are a whole nother story. Notes On Racial Phylogeny implies that the Argonians may have different reproductive systems than Man and Mer, thus it is unlikely that they can interbreed.