Tony Stark wasn't always the playboy that everybody knows today. Once upon a time he was actually in love. The result of that love was twins. A girl, Malia Faith Maria Stark/Hale, and a boy, Adrian James Kai Stark/Hale. But, unfortunately the love that brought the world the Stark twins wasn't supposed to last.
Clara Faith Hale was her name. The first person Anthony Edward Stark loved. The only person he loved. They were engaged to be married but, Clara's father has made a lot of enemies in his life. Unfortunately, these enemies found out about his daughter and decided that they were going to use her against him. Clara died protecting her 4 year olds from the people who were trying to kill them.
Lia, while she was a daddy's girl took more after her mum, yes she had the Stark brain but she also loved being able to learn about what her mum was like. Having the same interests as she did and the same skill set.Although Lia didn't like being cooped up in the lab all the time like her father and brother she was definitely a personality match with Tony. She had the outspoken ness and the Starkasm, the true personality of a Stark.
AJ, always found it more interesting to be in his father's lab learning everything and anything he could, he was very much a Stark. He had the brains and the looks. Although he was not as outspoken as his father and sister. much more like his mother. Not exactly shy but, rather quite content to be left to himself, also not wanting to be the center of attention in the room. He was happy to just be left to himself.
Disclaimer:
Sadly, I do not own the MCU, although it would be really cool if i did, all rights go to Stan Lee. The only thing that I own is AJ and Lia and their story lines as well as anything else I've added/changed anything else respectfully goes to the rightful owners.