Most students have more than one parent to add as a relationship to their core profile. The current configuration requires searching for then selecting one parent at a time, saving, then starting the process over for the other parent. There should be a radio button to select multiple parents to add.
This is also the case when adding a new grandparent who has multiple grandchildren in the school. Having to do each grandchild individually even though they all show up in the Search by last name is a pain. It would be nice if we could either have "add another" and/or a way to select multiple persons within the same last name search.