[Western Crossover] Boundaries

When the Malfoy family, who pride themselves on their pure-blood heritage, gets a Muggle son-in-law, and Lucius gets a son-in-law who isn't much younger than he is, what happens when Iron Man becomes a wizard's son-in-law? Can Voldemort still control the Malfoy family?

Theme: I'm really curious whether Iron Man could have survived if the story had gone a little further out of the box.