1.  Genetic testing of sibling.  The court may order genetic testing of a sibling of a person if the person is commonly believed to have an identical sibling and evidence suggests that the sibling may be the genetic father or genetic mother of the child.  

2.  Nongenetic evidence.  If a person and a sibling of the person tested pursuant to subsection 1 satisfy the requirements as the identified genetic father or genetic mother of the child under section 1904 without consideration of another identical sibling being identified as the genetic father or genetic mother of the child, the court may rely on nongenetic evidence to adjudicate parentage under this chapter.