YELIZAVETA GRYSHCHENKO

Wikipedia
8/19/1934
Yelizaveta Liza Gryshchenko, 6 years old, gave birth after being impregnated by her 69year old maternal grandfather, a former sailor.  The baby died during labor. After theincident, the family immigrated to Vladivostok, taking the girl's grandfather with them.
(Soviet Union)