Being the child of a brief fling is awkward. Being the child of a brief fling between a superhero and the Princess of the alien race who kidnapped him is much, much worse - and also the vaguely uncomfortable reality of Hulkling, a member of the Young Avengers.
But, before you get confused, it's worth saying that Hulkling's parent isn't the Captain Marvel you might be thinking of. Instead of Carol Danvers, it's actually the original Captain, who is also known as Mar-Vell.
Due to his unusual parental circumstances, Theo grew up with a fair few daddy issues - fixed somewhat when his met his dad as a young man, although he would only get to meet him this once before Mar-Vell would pass away.