It’s a dilemma familiar to any TV showrunner with kids in the cast: the inevitable march of time. Stranger Things recently dealt with this , and now there’s another popular series with a child star in A Knight of the Seven Kingdoms . By way of comparison, Dexter Sol Ansell , who plays Egg, is 11—just a year younger than Millie Bobby Brown was when Stranger Things began. But fear not, fans of the tiny bald squire; A Knight of the Seven Kingdoms creator Ira Parker already has a long-range plan in place for the character. First things first: Parker would never consider recasting Egg, so he’s hoping to film as many installments as possible while Ansell is still a tween. (So far, HBO has only greenlit A Knight of the Seven Kingdoms for a second season , which is now in production.) Speaking to Decider , Parker said his dream is to adapt George R.R.…