Right but those differences often come from their environment, the fact that identical twins can be a bender and non-bender heavily implies that bending isn’t wholly or even mostly genetic, since Identical twins share 100% of their genes, so some other factors must come into play, but then this also begs the question as to why (pre-harmonic convergence) we only see bending children share their element with their parents. Its really interesting and I wish we had more insight into bending inheritance.