I have a weird story too Yoda. My nana had a daughter out of wedlock waaaaay back and she kept her.  She came back to NZ from NSW where she had gone to give birth and a little later married my grandfather.  He was not my aunties father.  Aunty grew up and named 2 of her sons Ivan and Ross.  After my grandmothers death dad found his sisters birth cert.  He hid it and bought it home.  My aunties father was Ivan Ross.  She never knew until dad gave her the full birth cert when her sons were already grown and married.