Medpundit writes "Two Mothers/Two Aunts: If a woman conceives a baby thanks to her sister's ovary, is she the baby's mother or aunt? (Not to mention the question of the sister.) If this becomes popular, as the surgeon hopes it will, we'll need a new word for the mother/aunt combo. (Maunt?)"
If you have no difficulties conceptualizing this complicated family relationship, then you have what it takes to be a psychiatrist. Recently when I asked a new patient why she was coming to see me, she told me "My Grandfather is my Father" (The mother of the patient was sexually abused by her (the mother's) father). Psychiatrists are used to hearing complicated stories about incest and about step and half siblings molesting each other, as well as sexual abuse by step-parents and boyfriends. Sadly, it doesn't take me long anymore to understand how everyone is related.