The Superior Six

It's a superhero movie, about six siblings. It centers around the oldest sibling, Peter who has put his superhero past behind him, now as a beyond-borders doctor. His life is turned around when he receives news from his siblings that their mother has disappeared and he sets out to reunite with his siblings, coming back to the life he had suppressed for years. In reuniting with them, he must deal with their growing dysfunction while trying to find their mother and battle an acidic villain.