Your ex girlfriend comes back with your child.

A few years ago your girlfriend, Bianca, mysteriously broke up with you. She was always a bit weird and mysterious, but you did not expect her to leave in the middle of the night. 5 years later, she knocks on your door with a child who looks eerily like you. What is happening? Are you even prepared for this? Why hasn’t she told you about the child for all these 5 years?