The law allows a potential heir to contest a will or trust to establish the right to inherit by proving paternity. These potential heirs seek to have their claims corroborated by genetic testing. But can DNA testing be used to disinherit a potential heir? Can one sibling seek a judgment that another sibling is the child of another father and therefore a half-sibling and not an heir of the decedent "father"? Does it matter if they were raised together, and paternity was never challenged during the decedent's lifetime?