Imagine becoming friends with someone your freshman year of college not knowing they are actually your sibling.
Exactly that happened to two Tulane University students.
Mikayla Stern-Ellis and Emily Nappi met on Facebook while trying to find a freshman year roommate, according to The Tulane Hullabaloo.
Nappi had already found a roommate but the two girls stayed in touch through Facebook. Upon becoming closer friends, the girls discovered they both had sperm donor fathers.
The school's newspaper says the girls would joke with each other about the possibility of sharing a father but never seriously entertained the thought.
Stern-Ellis' parents saw so many commonalities between the friends they questioned whether they really did have the same donor.
The girls exchanged their donor number to see whether they were related, and as it turns out, they are. The girls are half-sisters.
They say they share a lot of traits and are thankful they have found each other.