Nina, are you trying to do this in the tree? Are these sets of parents the same? If so, you just have to wait out the merge process. If the parents are different, you need to go to the persons profile, "Edit" then "Relationships". At the bottom, you might have to wait a few seconds, but the parents will show up. Put a check mark by the wrong pair and click on delete. Ignore the split the tree warning and delete them then save. Not as complicated as it sounds. If you can't edit the tree then you need to collaborate with the manager and get editing rights.