Wow thats alot of Questions.Ok regarding Air nomads
-All Air Nomads are Airbenders
-There are Female Air monks example Avatar YangChen and the woman that brought Aang to chhose his bison
-Eastern Air temple is the one that has all the female Air monks,it has a statue of Avatar Yangchen
-I think all the baby air nomads are Raised communally but are looked after mostly by one specific monk
-As they are monks the children are separated from their parents so they have no attachments as Air nomads are meant to detach themselfs from the world.
Whether bending is genetics or spiritual is a massive debate in the fandom.
but i think because of all air nomads are very spiritual and being benders proves that its spiritual.But also a bit genetic as in 114 there are twins and 1 can earthbend and one cant.
Hope i answered your questions to a good level.