He's not the oldest and he's not the youngest — but Trump's "middle-late" birth order offers some insight into why he is the way he is.

The study, “Asexuality: Its Relationship to Sibling Sex Composition and Birth Order,” was authored by Bozena Zdaniuk, Sonia Milani, Brett Makarenko, Nicola Marriott, Anthony F. Bogaert, and ...

Clinical psychologist Dr. Samantha Rodman Whiten addresses how your relationships with your siblings affect your marriage. Having brothers or sisters can make all the difference in your relationships.