"Sort of. See..." There really wasn't an easy way to tell your child you had no idea who they were. They should make a slide show for this. "Remember the whole 'same people, different worlds' thing? Lyra is my daughter with another person from another world. Pym isn't technically ours, his parents haven't come through this Entity yet so he lives with me and we love him a lot."
Bruce leaned back on his heels, giving the little boy a full once over. He could see it. It was strange, actually seeing himself in another person. With Lyra it was obviously different for obvious reasons. But Robbie? "We've got a really big family here, kiddo. Lots of people from lots of places. And they're all going to love you a lot."