Mark and Julia's case is slightly different. Remember in Child's Play, when Mark's thinking that he's soon to be the father of seven psychic children? If one of them had only a single gene (Mark of power or Julia of control) at least one of those kids would have not been a psychic (either a power pack or a normal person). As it is, all seven, including the two on the way, are strong psychics. So both Mark and Julia have two genes of their respective gene. All of their kids will be psychics. Although, I hope for Julia's sake, especially, they space those pregnancies out a little more. It's not like they have only until 40 or so like we do to have kids, after all!
Tara
