You work together in a Detective agency (and you're married) and once on one of the investigations you managed to save a child from a difficult situation: the child's father,who locked him alone in a bunker for few months,convincing him that there are dangerous entities outside therefore the child has mental disorders. (girl or boy, age of your choice) You accepted to adopt him.The child is happy to live with you, you're good parents for him,as he says.