Patrick Stübing (born 1977 in Leipzig, East Germany) is a German who has been in a relationship with his biological sister, Susan Karolewski, since 2001. The relationship has produced four children: Eric, Sarah, Nancy, and Sofia. Only one child, Sofia, remains with the couple. Two children suffer from severe physical and mental disabilities, and another was born with a heart condition that required a heart transplant. All three disabled children were placed in foster care.