She says that her patients are typically shy towards strangers.
People in incestuous relationships often lack that skill.
A romantic relationship eventually developed between the two.
Lena had her first real boyfriend at 17-years-old.
At one point Tom became depressed and tried to kill himself.
More importantly, relationships between siblings are defined by envy, rivalry, and admiration, along with the need to cuddle or have secrets from the rest of the world.