Well there was also X-Men Evolution and Wolverine and the X-Men that have them back during their Brotherhood years. Being a little liberal with how their relationship was. Capturing the basics at least. But people who only watch that are only gonna know that about the characters. I also think family dynamics are a lot more popular than Marvel thinks. But they seem to have an aversion to it. The newest Star Wars films did too. Maybe it's a company wide problem, lol.