I have found that when you friend people for the purpose of sorority life and once they join your house, you can de-friend them from your friends list and they will still be in your house.
Just wanted to let you know this worked! Thanks for the advice.
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"Life is service. The one who progresses is the one who gives his fellow human beings a little more, a little better service." - E. M. Statler 1863 - 1928