Couple Claims They Adopted an Adult Posing as a Child… but Is It True?

Natalia Barnett, a Ukranian orphan was living with her adoptive parents, Kristine and Michael Barnett, who have said she is actually a 20-something woman with a short stature as a result of a condition she has called spondyloepiphyseal dysplasia congenita. They have claimed that Natalia has scammed them, and even threatened violence against them. Is there any truth to these claims?