"Your personality is directly related to how you interact with other people," says William Cane, author of The Birth Order Book of Love, since the first people you interacted with were your parents and siblings.
Figuring out your own birth-order personality, and that of your significant other, is simply one strategy you can use to assess your compatibility, adds Catherine Salmon, Ph D, professor of psychology at the University of Redlands in California, and coauthor of the upcoming book, The Myth of the Middle Child.
Relationship Tip: Have frequent, air-clearing conversations about everything from money and sex to the kids, home and work so your individual needs don't get drowned in a sea of compromise.
Relationship Tip: Try to suss out whether you have controlling tendencies (which you should keep in check so you don't overwhelm your younger-sib spouse) or if you both are acting like "babies."Youngest with Youngest These two can have a lot of fun—a pair of carefree, risk-taking lovers nearly always do.Of course, a lot depends on how domineering the firstborn partner is, and how "classic" the middle child's accommodating personality is.Remember, such variables as gender and age spacing play a role in how close your personality hews to the birth-order line, says Dr. A middle child with close-in-age older and younger siblings is more "middle-ish" than one whose younger or older sibs are years apart.That said, they can be predictable in the best sense of that word."Middleborns are the Type O blood of relationships: They go with anyone," says Dr. As a general rule, middles tend to be good at compromise—a skill valuable to them as they negotiated between bossy older sibs and needy younger ones.