#Junlai

Junzai Shunpei, 28-upper right (deceased)
Alai Shunpei, 24-lower left (deceased)

So they suffered mental and emotional abuse from their mother who killed their father after Alai was born a year later. Their mother was an airbender and was an expert in lavabending/metalbending. Their father however was a prodigy in combustbending. Junzai, being the prodigy, was the favorite but had all the expectations. So Junzai knows combustbending, metalbending. Alai knows airbending and lavabending.