In an interview with Screen Rant, It’s been acknowledged that Scott Lang’s daughter Cassandra Lang would be in the film, Cassie eventually becomes the Young Avenger named Stature, but she was originally introduced as Scott’s ailing little girl whose illness propelled him to steal Hank Pym’s Ant-Man suit to try to save her.
“The thematic arc really is a sort of passing-of-the-torch movie,” “[Paul] Rudd’s character is an ex-con, a thief. It’s also got the structure of a heist movie. And there’s also a real personal dynamic to the movie, too. In the comics, Scott Lang has a daughter, and that’s part of the movie, too.”
Well let rumours begin on a Young Avengers movie in the future.