Filtering Parents

Here is the deal...
While creating a Family_group node, Parent1 and Parent2 both display the same Individuals list.
Is there any way to modify the function that retrieves individuals to display only male or female individuals? and then duplicate the function, in order to have Parent1 displaying only Males and Parent2 only females...

Maybe some sort of modification to

$parents=array();
  $indivs=db_query('SELECT nid, title_format, gender FROM {family_individual}');
  if($indivs){
	while($data = db_fetch_array($indivs)){
		$parents[$data['nid']]=$data['title_format'];
	}
  }

Thanks and sorry for my english..

Martin
Happy holidays from Argentina !