Actually, because Lewis (His biological child) is half elf and we don't know what race Lewis' mom is his dad (Sakka) could be an elf. This is a plausible theory because Pacthesis states in her Sim boys meme ( pacthesis.deviantart.com/art/S… ) that Sakka might not even be human. The actual quote is 'said' by Kai and is "Well, 4 and 9 are probably not even human..." with 4 being Sakka and 9 being Veon. As Veon is canon to be a cat we can assume that Sakka is indeed not fully human, if he is human at all.

Amy made the race a question mark because she wanted Sakka's race to be a secret or something that we (the fans) have to search and research for evidence and proof that he is human, hybrid (part human, part not-human), or elf. So, taking in all that I have stated, does Sakka's race seem clearer now, or have I made it too complex?