If elements were more lineage based and not stuck 1:1 per parent what element would you hc the air kids as having. (Assuming Pema is a non bending daughter of at least one earthbender)
//Personally, I've always imagined Pemzin's kids as having the potential to be Airbenders (bc of Aang being of Air Nomad decent), Waterbenders (bc of Katara being of Water Tribe decent) and Earthbenders (bc of Pema being of Earth Kingdom decent). If one of Pema's parents were from Fire Nation decent, then I'd include that as well.
But I imagine it not extending past grandparents, because the creators specifically say it's not about bloodlines, but rather a spiritual connection, with each culture providing a different spiritual vantage point. So, while I do believe in some genetics having to do with ethnic grouping, I still think grooming is an important factor. By fostering the Air Nomad side of their heritage, they are more likely to develop into Airbenders than any other element.
With this in mind we know of three canon aspects that attribute to being able to bend: ethnic grouping/cultural upbringing (decides which element you're predisposed to developing), spiritual connection (how likely you'll be a bender), and a physical aspect having to do with blood flow and chi channels in/around the brain (an on-and-off switch basically).
Here's a snippet of an interview Bryke did for avatarspirit.net (the main online community for atla/lok content before tumblr arrived) that supports this. This is from April 2007. I've bolded the text I found most relevant.
RM: Okay, next I know I'm going really left brained and you can call me a geek because I am, but in "The Fortuneteller" you have a pair of twins...kids...one is an earthbender and one isn't. So is bending genetic, or is it some sort of spiritual thing? How does it work? BK: Mike and I just got new puppies. They're brothers. They have the same mother and father. Same litter. Mike's dog can just sit in a crate and be happy as a clam. My dog just loses all control...everything. Who knows why these things happen? They're beyond our full understanding. MDD: Yeah, Katara's mom and dad weren't benders. Maybe it's a recessive gene. I've always seen it as more spiritual connections, though. A little bit mysterious... BK: I mean we've definitely talked about it. I think, again, sometimes we might not know...it's more of what we don't want it to be. We didn't want it to be like there is a lineage...a royal family or something...and these people can bend and then there's everyone else as non-bending, people who never will. Some sort of caste system. Mike and I are more attracted to more of the flux type universe. The only constant is change, variation, that sorta thing. I'm sure it's a bunch of factors. ***Interviewers note: About 20 mins after the interview, Bryan came back to me and we spoke a little more about the basis of bending off recorder. He described bending as more of a talent. You have some genetic basis for potential, but you could go your whole life without developing the talent into ability. Some people have more inherent talent than others, while others with minimal inherent talent can still develop it through hard work and practice. He reiterated a connection to the spiritual energies is the underlying basis. How it manifests is based on upbringing and experience. RM: So could Teo's people perhaps grow into the airbenders of the future? BK: I think Teo's people are more refugees. They probably came together because they're not benders and really had no way to defend themselves. Then fell under this nutty guy who has his own skill and aura of authority. I don't think it's an ethnic group of non-benders, rather they were all just escaping the disasters of war. MDD: Yeah, I think if you've gone through puberty and not found any bending abilities, you're probably not going to find them. I think it manifests early. BK: Although that would make a pretty outrageous story. Some 80 year old guy... MDD: "Wow, I never knew!" BK: ...fire starts shooting out... RM: I was just curious if the airbenders could just come back from the general population rather than necessarily having to come back through Aang or anyone else who came from the airbending lineage. MDD: Aang is the last Airbender, so I don't think it's possible for Airbending to spontaneously develop in the general population. RM: It seems like all the Air Nomads were benders. Did they exile everyone who didn't manifest the trait, or did they really have such a high percentage of born benders? BK: We always have liked the idea of who will be a bender and who won't be to be kind of an ambiguous mystery, even to the people in the Avatar world. From early on we thought the Air Nomads would be all benders. Again it's like Mike was saying, it's more of a spiritual connection. But they have...they had...the smallest population. Earth Kingdom has the biggest population but the smallest percentage of benders. So yeah, there were these notions we kicked around that is wasn't going to be regimented or ruled through specific lineages. We liked the idea that each of the cultures have a different spiritual vantage point...coming at it from a different angle. MDD: Then the Air Nomads would have been the most spiritual...the most connected to the spiritual energy of the Earth. BK: But the most detached from society. More monastic.
