Factual error: Shortly after David and Griffin jump to Japan, Griffin goes to a car dealership and takes a Mercedes. Griffin then drives on the right side of the street rather than on the left as he should in Japan.
Factual error: The bus' horn makes a sound like a truck's klaxon. A London bus horn is higher pitched than that. (01:07:10)
Factual error: As Millie gets out of the car, she is greeted by an Italian who addresses her as "signora" ("madam"). In Italy, young women are addressed as "signorina" ("miss"). (00:30:15)
Chosen answer: It's certainly not out of the question. That being said, Sophie is only David's half-sister, as they have different fathers, so if the jumper traits came from David's father, or from some genetic combination of his parents, then Sophie would not share his abilities.
Tailkinker ★