(a) Subject to subsection (b), if a genetic-testing specimen is not available from a man who may be the father of a child, for good cause and under circumstances the court considers to be just, the court may order the following individuals to submit specimens for genetic testing:
         (1) the parents of the man;

Terms Used In Illinois Compiled Statutes 750 ILCS 46/408


         (2) brothers and sisters of the man;
         (3) other children of the man and their mothers; and
         (4) other relatives of the man necessary to complete
    
genetic testing.
    (b) Issuance of an order under this Section requires a finding that a need for genetic testing outweighs the legitimate interests of the individual sought to be tested, and in no event shall an order be issued until the individual is joined as a party and given notice as required under the Code of Civil Procedure.