"My aunt is my mother's sister."
Translation:Min moster är min mors syster.
Thanks for pointing that out, I removed it again. Someone probably just added it by mistake. We're not supposed to accept translations that require adding an unlikely context. Maybe someone has en moster who is also their faster – if the aunt in question is a half sister of both of their parents, they wouldn't even have to be related to each other at all – but allowing for odd cases like that would be more misleading than helpful.