Parents of people with Dubowitz syndrome are sometimes related, and there have been several cases of it occurring in monozygotic twins, siblings, and cousins. There is great variability in symptoms between cases, especially in intelligence.
Parents of individuals with Dubowitz syndrome often share a common heritage, and there have been instances of it occurring in monozygotic twins, family members, and close relatives. There is significant variability in the presentation of symptoms, particularly in intellectual functioning.