I've always considered Barnabas and Julia to be Adam's parents. She protested when Barn wanted to destroy Adam iin his first moments of life, convincing him that THEY had done this and were responsible. Although Barn and Jul don't maintain much in the way of parental control (leaving Adam with the jealous, tormenting Willie is a huge error), they brought Adam into the world and really should have done better by him.
Julia has some maternal moments coming up in the show, in other storylines, but it's true--beyond the creation, Julia doesn't seem especially interested in Adam--he's more of a problem to be solved.
However, neither Barnabas nor Julia expected Barnabas to live; only Adam was expected to survive. And since they never did listen to Dr. Lang's tape, like their "son" has, it never occurred to them as a possibility--something that SHOULD have included in Lang's notebook outlining the experiment. When did this possibility occur to Lang--in his death throes?
Love, Robin